diff --git a/bsnes/emulator/emulator.hpp b/bsnes/emulator/emulator.hpp
index 99ccfda6..63faea03 100644
--- a/bsnes/emulator/emulator.hpp
+++ b/bsnes/emulator/emulator.hpp
@@ -29,13 +29,13 @@ using namespace nall;
 
 namespace Emulator {
   static const string Name    = "bsnes";
-  static const string Version = "114";
+  static const string Version = "114.1";
   static const string Author  = "byuu";
   static const string License = "GPLv3";
   static const string Website = "https://byuu.org";
 
   //incremented only when serialization format changes
-  static const string SerializerVersion = "112";
+  static const string SerializerVersion = "114.1";
 
   namespace Constants {
     namespace Colorburst {
diff --git a/bsnes/sfc/ppu-fast/background.cpp b/bsnes/sfc/ppu-fast/background.cpp
index 792e5be0..cb880bd6 100644
--- a/bsnes/sfc/ppu-fast/background.cpp
+++ b/bsnes/sfc/ppu-fast/background.cpp
@@ -1,15 +1,3 @@
-//single-threaded
-auto PPU::Line::cacheBackground(PPU::IO::Background& bg) -> void {
-  if(y == 1) {
-    bg.mosaicCounter = ppu.io.mosaicSize + 1;
-    bg.mosaicOffset = 1;
-  } else if(--bg.mosaicCounter == 0) {
-    bg.mosaicCounter = ppu.io.mosaicSize + 1;
-    bg.mosaicOffset += ppu.io.mosaicSize + 1;
-  }
-}
-
-//parallelized
 auto PPU::Line::renderBackground(PPU::IO::Background& self, uint8 source) -> void {
   if(!self.aboveEnable && !self.belowEnable) return;
   if(self.tileMode == TileMode::Mode7) return renderMode7(self, source);
@@ -39,10 +27,14 @@ auto PPU::Line::renderBackground(PPU::IO::Background& self, uint8 source) -> voi
   uint hmask = (width << self.tileSize << !!(self.screenSize & 1)) - 1;
   uint vmask = (width << self.tileSize << !!(self.screenSize & 2)) - 1;
 
-  uint y = self.mosaicEnable ? self.mosaicOffset : this->y;
+  uint y = this->y;
+  if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter;
   if(hires) {
     hscroll <<= 1;
-    if(io.interlace) y = y << 1 | field();
+    if(io.interlace) {
+      y = y << 1 | field();
+      if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter + ppu.field();
+    }
   }
 
   uint mosaicCounter = 1;
@@ -103,7 +95,7 @@ auto PPU::Line::renderBackground(PPU::IO::Background& self, uint8 source) -> voi
 
     for(uint tileX = 0; tileX < 8; tileX++, x++) {
       if(x & width) continue;  //x < 0 || x >= width
-      if(!self.mosaicEnable || --mosaicCounter == 0) {
+      if(--mosaicCounter == 0) {
         uint color, shift = mirrorX ? tileX : 7 - tileX;
       /*if(self.tileMode >= TileMode::BPP2)*/ {
           color  = data >> shift +  0 &   1;
@@ -120,7 +112,7 @@ auto PPU::Line::renderBackground(PPU::IO::Background& self, uint8 source) -> voi
           color += data >> shift + 49 & 128;
         }
 
-        mosaicCounter = 1 + io.mosaicSize;
+        mosaicCounter = self.mosaicEnable ? io.mosaic.size : 1;
         mosaicPalette = color;
         mosaicPriority = tilePriority;
         if(directColorMode) {
diff --git a/bsnes/sfc/ppu-fast/io.cpp b/bsnes/sfc/ppu-fast/io.cpp
index 9db01ea0..7447be79 100644
--- a/bsnes/sfc/ppu-fast/io.cpp
+++ b/bsnes/sfc/ppu-fast/io.cpp
@@ -248,11 +248,17 @@ auto PPU::writeIO(uint address, uint8 data) -> void {
   }
 
   case 0x2106: {  //MOSAIC
+    bool enable = io.bg1.mosaicEnable || io.bg2.mosaicEnable || io.bg3.mosaicEnable || io.bg4.mosaicEnable;
     io.bg1.mosaicEnable = data >> 0 & 1;
     io.bg2.mosaicEnable = data >> 1 & 1;
     io.bg3.mosaicEnable = data >> 2 & 1;
     io.bg4.mosaicEnable = data >> 3 & 1;
-    io.mosaicSize       = data >> 4 & 15;
+    io.mosaic.enable    = data >> 0 & 15;
+    io.mosaic.size      = (data >> 4 & 15) + 1;
+    if(!enable && (data >> 0 & 15)) {
+      //mosaic vcounter is reloaded when mosaic becomes enabled
+      io.mosaic.counter = io.mosaic.size + 1;
+    }
     return;
   }
 
diff --git a/bsnes/sfc/ppu-fast/line.cpp b/bsnes/sfc/ppu-fast/line.cpp
index 7341728c..f14a9899 100644
--- a/bsnes/sfc/ppu-fast/line.cpp
+++ b/bsnes/sfc/ppu-fast/line.cpp
@@ -26,12 +26,13 @@ auto PPU::Line::flush() -> void {
 }
 
 auto PPU::Line::cache() -> void {
-  cacheBackground(ppu.io.bg1);
-  cacheBackground(ppu.io.bg2);
-  cacheBackground(ppu.io.bg3);
-  cacheBackground(ppu.io.bg4);
-
   uint y = ppu.vcounter();
+  if(y == 1) {
+    ppu.io.mosaic.counter = ppu.io.mosaic.enable ? ppu.io.mosaic.size + 1 : 0;
+  }
+  if(ppu.io.mosaic.counter && !--ppu.io.mosaic.counter) {
+    ppu.io.mosaic.counter = ppu.io.mosaic.enable ? ppu.io.mosaic.size + 0 : 0;
+  }
   if(ppu.io.displayDisable || y >= ppu.vdisp()) {
     io.displayDisable = true;
   } else {
diff --git a/bsnes/sfc/ppu-fast/mode7.cpp b/bsnes/sfc/ppu-fast/mode7.cpp
index 7b59bbda..c5251c17 100644
--- a/bsnes/sfc/ppu-fast/mode7.cpp
+++ b/bsnes/sfc/ppu-fast/mode7.cpp
@@ -1,11 +1,12 @@
 auto PPU::Line::renderMode7(PPU::IO::Background& self, uint8 source) -> void {
   //HD mode 7 support
-  if(!ppu.hdMosaic() || !self.mosaicEnable || !io.mosaicSize) {
+  if(!ppu.hdMosaic() || !self.mosaicEnable || !io.mosaic.size) {
     if(ppu.hdScale() > 1) return renderMode7HD(self, source);
   }
 
-  int Y = self.mosaicEnable ? self.mosaicOffset : this->y;
+  int Y = this->y;
   int y = !io.mode7.vflip ? Y : 255 - Y;
+  if(self.mosaicEnable) y -= io.mosaic.size - io.mosaic.counter;
 
   int a = (int16)io.mode7.a;
   int b = (int16)io.mode7.b;
@@ -50,8 +51,8 @@ auto PPU::Line::renderMode7(PPU::IO::Background& self, uint8 source) -> void {
       palette &= 0x7f;
     }
 
-    if(!self.mosaicEnable || --mosaicCounter == 0) {
-      mosaicCounter = 1 + io.mosaicSize;
+    if(--mosaicCounter == 0) {
+      mosaicCounter = self.mosaicEnable ? io.mosaic.size : 1;
       mosaicPalette = palette;
       mosaicPriority = priority;
       if(io.col.directColor && source == Source::BG1) {
diff --git a/bsnes/sfc/ppu-fast/ppu.hpp b/bsnes/sfc/ppu-fast/ppu.hpp
index f93b39a3..61e8aea5 100644
--- a/bsnes/sfc/ppu-fast/ppu.hpp
+++ b/bsnes/sfc/ppu-fast/ppu.hpp
@@ -85,7 +85,6 @@ public:
     bool oamPriority = 0;
     bool bgPriority = 0;
     uint8 bgMode = 0;
-    uint8 mosaicSize = 0;
     bool vramIncrementMode = 0;
     uint8 vramMapping = 0;
     uint8 vramIncrementSize = 0;
@@ -99,6 +98,15 @@ public:
     bool pseudoHires = 0;
     bool extbg = 0;
 
+    struct Mosaic {
+      //serialization.cpp
+      auto serialize(serializer&) -> void;
+
+      uint8 enable = 0;
+      uint8 size = 1;
+      uint8 counter = 0;
+    } mosaic;
+
     struct Mode7 {
       //serialization.cpp
       auto serialize(serializer&) -> void;
@@ -161,8 +169,6 @@ public:
       bool aboveEnable = 0;
       bool belowEnable = 0;
       bool mosaicEnable = 0;
-      uint16 mosaicCounter = 0;
-      uint16 mosaicOffset = 0;
       uint16 tiledataAddress = 0;
       uint16 screenAddress = 0;
       uint8 screenSize = 0;
@@ -293,7 +299,6 @@ public:
     alwaysinline auto plotHD(Pixel*, uint x, uint8 source, uint8 priority, uint16 color, bool hires, bool subpixel) -> void;
 
     //background.cpp
-    auto cacheBackground(PPU::IO::Background&) -> void;
     auto renderBackground(PPU::IO::Background&, uint8 source) -> void;
     auto getTile(PPU::IO::Background&, uint hoffset, uint voffset) -> uint;
 
diff --git a/bsnes/sfc/ppu-fast/serialization.cpp b/bsnes/sfc/ppu-fast/serialization.cpp
index 7dbdb6b0..75248288 100644
--- a/bsnes/sfc/ppu-fast/serialization.cpp
+++ b/bsnes/sfc/ppu-fast/serialization.cpp
@@ -44,7 +44,6 @@ auto PPU::IO::serialize(serializer& s) -> void {
   s.integer(oamPriority);
   s.integer(bgPriority);
   s.integer(bgMode);
-  s.integer(mosaicSize);
   s.integer(vramIncrementMode);
   s.integer(vramMapping);
   s.integer(vramIncrementSize);
@@ -58,6 +57,7 @@ auto PPU::IO::serialize(serializer& s) -> void {
   s.integer(pseudoHires);
   s.integer(extbg);
 
+  mosaic.serialize(s);
   mode7.serialize(s);
   window.serialize(s);
   bg1.serialize(s);
@@ -68,6 +68,12 @@ auto PPU::IO::serialize(serializer& s) -> void {
   col.serialize(s);
 }
 
+auto PPU::IO::Mosaic::serialize(serializer& s) -> void {
+  s.integer(enable);
+  s.integer(size);
+  s.integer(counter);
+}
+
 auto PPU::IO::Mode7::serialize(serializer& s) -> void {
   s.integer(hflip);
   s.integer(vflip);
@@ -114,8 +120,6 @@ auto PPU::IO::Background::serialize(serializer& s) -> void {
   s.integer(aboveEnable);
   s.integer(belowEnable);
   s.integer(mosaicEnable);
-  s.integer(mosaicCounter);
-  s.integer(mosaicOffset);
   s.integer(tiledataAddress);
   s.integer(screenAddress);
   s.integer(screenSize);
diff --git a/bsnes/sfc/ppu/background.cpp b/bsnes/sfc/ppu/background.cpp
index a03cc28f..09db47e3 100644
--- a/bsnes/sfc/ppu/background.cpp
+++ b/bsnes/sfc/ppu/background.cpp
@@ -1,5 +1,4 @@
 #include "mode7.cpp"
-uint4 PPU::Background::Mosaic::size;
 
 auto PPU::Background::hires() const -> bool {
   return ppu.io.bgMode == 5 || ppu.io.bgMode == 6;
@@ -11,26 +10,13 @@ auto PPU::Background::frame() -> void {
 
 //H = 0
 auto PPU::Background::scanline() -> void {
-  if(ppu.vcounter() == 1) {
-    mosaic.vcounter = mosaic.size + 1;
-    mosaic.voffset = 1;
-    latch.hoffset = io.hoffset;
-    latch.voffset = io.voffset;
-  } else if(--mosaic.vcounter == 0) {
-    mosaic.vcounter = mosaic.size + 1;
-    mosaic.voffset += mosaic.size + 1;
-    latch.hoffset = io.hoffset;
-    latch.voffset = io.voffset;
-  }
-
-  mosaic.hcounter = mosaic.size + 1;
+  mosaic.hcounter = ppu.mosaic.size;
   mosaic.hoffset = 0;
 
   if(io.mode == Mode::Mode7) return beginMode7();
-  if(mosaic.size == 0) {
-    latch.hoffset = io.hoffset;
-    latch.voffset = io.voffset;
-  }
+
+  latch.hoffset = io.hoffset;
+  latch.voffset = io.voffset;
 
   nameTableIndex = 0;
   characterIndex = 0;
@@ -52,13 +38,17 @@ auto PPU::Background::fetchNameTable() -> void {
 
   int x = (ppu.hcounter() & ~31) >> 2;
   uint hpixel = x << hires();
-  uint vpixel = mosaic.enable ? (uint)mosaic.voffset : ppu.vcounter();
+  uint vpixel = ppu.vcounter();
+  uint hscroll = latch.hoffset;
+  uint vscroll = latch.voffset;
 
-  uint hscroll = mosaic.enable ? latch.hoffset : io.hoffset;
-  uint vscroll = mosaic.enable ? latch.voffset : io.voffset;
+  if(mosaic.enable) vpixel -= ppu.mosaic.voffset();
   if(hires()) {
     hscroll <<= 1;
-    if(ppu.io.interlace) vpixel = vpixel << 1 | (ppu.field() && !mosaic.enable);
+    if(ppu.io.interlace) {
+      vpixel = vpixel << 1 | ppu.field();
+      if(mosaic.enable) vpixel -= ppu.mosaic.voffset() + ppu.field();
+    }
   }
 
   bool repeated = false;
@@ -214,10 +204,10 @@ auto PPU::Background::run(bool screen) -> void {
 
   uint x = ppu.hcounter() - 56 >> 2;
   if(x == 0) {
-    mosaic.hcounter = mosaic.size + 1;
+    mosaic.hcounter = ppu.mosaic.size;
     mosaic.pixel = pixel;
   } else if((!hires() || screen == Screen::Below) && --mosaic.hcounter == 0) {
-    mosaic.hcounter = mosaic.size + 1;
+    mosaic.hcounter = ppu.mosaic.size;
     mosaic.pixel = pixel;
   } else if(mosaic.enable) {
     pixel = mosaic.pixel;
@@ -246,6 +236,5 @@ auto PPU::Background::power() -> void {
   output.below = {};
 
   mosaic = {};
-  mosaic.size = random();
   mosaic.enable = random();
 }
diff --git a/bsnes/sfc/ppu/background.hpp b/bsnes/sfc/ppu/background.hpp
index d952277f..4b752774 100644
--- a/bsnes/sfc/ppu/background.hpp
+++ b/bsnes/sfc/ppu/background.hpp
@@ -61,15 +61,9 @@ struct Background {
   } output;
 
   struct Mosaic {
-    static uint4 size;
      uint1 enable;
-
-    uint16 vcounter;
     uint16 hcounter;
-
-    uint16 voffset;
     uint16 hoffset;
-
     Pixel  pixel;
   } mosaic;
 
diff --git a/bsnes/sfc/ppu/io.cpp b/bsnes/sfc/ppu/io.cpp
index e809c785..fa07c7bd 100644
--- a/bsnes/sfc/ppu/io.cpp
+++ b/bsnes/sfc/ppu/io.cpp
@@ -262,11 +262,15 @@ auto PPU::writeIO(uint addr, uint8 data) -> void {
 
   //MOSAIC
   case 0x2106: {
+    if(!mosaic.enable() && (data >> 0 & 15)) {
+      //mosaic vcounter is reloaded when mosaic becomes enabled
+      mosaic.vcounter = (data >> 4 & 15) + 2;
+    }
     bg1.mosaic.enable = data >> 0 & 1;
     bg2.mosaic.enable = data >> 1 & 1;
     bg3.mosaic.enable = data >> 2 & 1;
     bg4.mosaic.enable = data >> 3 & 1;
-    Background::Mosaic::size = data >> 4 & 15;
+    mosaic.size       = (data >> 4 & 15) + 1;
     return;
   }
 
diff --git a/bsnes/sfc/ppu/main.cpp b/bsnes/sfc/ppu/main.cpp
index d2330d7c..07cbc54d 100644
--- a/bsnes/sfc/ppu/main.cpp
+++ b/bsnes/sfc/ppu/main.cpp
@@ -17,6 +17,7 @@ auto PPU::main() -> void {
     obj.frame();
   }
 
+  mosaic.scanline();
   bg1.scanline();
   bg2.scanline();
   bg3.scanline();
diff --git a/bsnes/sfc/ppu/mode7.cpp b/bsnes/sfc/ppu/mode7.cpp
index 3af38b9b..af246453 100644
--- a/bsnes/sfc/ppu/mode7.cpp
+++ b/bsnes/sfc/ppu/mode7.cpp
@@ -21,13 +21,12 @@ auto PPU::Background::runMode7() -> void {
   int voffset = (int13)latch.voffset;
 
   uint x = mosaic.hoffset;
-  uint y = !mosaic.enable ? ppu.vcounter() : ppu.bg1.mosaic.voffset;  //BG2 vertical mosaic uses BG1 mosaic size
+  uint y = ppu.vcounter();
+  if(ppu.bg1.mosaic.enable) y -= ppu.mosaic.voffset();  //BG2 vertical mosaic uses BG1 mosaic enable
 
-  if(!mosaic.enable) {
-    mosaic.hoffset += 1;
-  } else if(--mosaic.hcounter == 0) {
-    mosaic.hcounter = mosaic.size + 1;
-    mosaic.hoffset += mosaic.size + 1;
+  if(--mosaic.hcounter == 0) {
+    mosaic.hcounter = ppu.mosaic.size;
+    mosaic.hoffset += ppu.mosaic.size;
   }
 
   if(ppu.io.hflipMode7) x = 255 - x;
diff --git a/bsnes/sfc/ppu/mosaic.cpp b/bsnes/sfc/ppu/mosaic.cpp
new file mode 100644
index 00000000..79fe4d51
--- /dev/null
+++ b/bsnes/sfc/ppu/mosaic.cpp
@@ -0,0 +1,26 @@
+auto PPU::Mosaic::enable() const -> bool {
+  if(ppu.bg1.mosaic.enable) return true;
+  if(ppu.bg2.mosaic.enable) return true;
+  if(ppu.bg3.mosaic.enable) return true;
+  if(ppu.bg4.mosaic.enable) return true;
+  return false;
+}
+
+auto PPU::Mosaic::voffset() const -> uint {
+  return size - vcounter;
+}
+
+//H = 0
+auto PPU::Mosaic::scanline() -> void {
+  if(ppu.vcounter() == 1) {
+    vcounter = enable() ? size + 1 : 0;
+  }
+  if(vcounter && !--vcounter) {
+    vcounter = enable() ? size + 0 : 0;
+  }
+}
+
+auto PPU::Mosaic::power() -> void {
+  size = (random() & 15) + 1;
+  vcounter = 0;
+}
diff --git a/bsnes/sfc/ppu/mosaic.hpp b/bsnes/sfc/ppu/mosaic.hpp
new file mode 100644
index 00000000..261739e6
--- /dev/null
+++ b/bsnes/sfc/ppu/mosaic.hpp
@@ -0,0 +1,13 @@
+struct Mosaic {
+  //mosaic.cpp
+  alwaysinline auto enable() const -> bool;
+  alwaysinline auto voffset() const -> uint;
+  auto scanline() -> void;
+  auto power() -> void;
+
+  //serialization.cpp
+  auto serialize(serializer&) -> void;
+
+  uint5 size;
+  uint5 vcounter;
+};
diff --git a/bsnes/sfc/ppu/ppu.cpp b/bsnes/sfc/ppu/ppu.cpp
index 6ec524ec..dc8d135f 100644
--- a/bsnes/sfc/ppu/ppu.cpp
+++ b/bsnes/sfc/ppu/ppu.cpp
@@ -5,6 +5,7 @@ namespace SuperFamicom {
 PPU ppu;
 #include "main.cpp"
 #include "io.cpp"
+#include "mosaic.cpp"
 #include "background.cpp"
 #include "object.cpp"
 #include "window.cpp"
@@ -173,6 +174,7 @@ auto PPU::power(bool reset) -> void {
   //$213d  OPVCT
   io.vcounter = 0;
 
+  mosaic.power();
   bg1.power();
   bg2.power();
   bg3.power();
diff --git a/bsnes/sfc/ppu/ppu.hpp b/bsnes/sfc/ppu/ppu.hpp
index f7eac0f7..353acf27 100644
--- a/bsnes/sfc/ppu/ppu.hpp
+++ b/bsnes/sfc/ppu/ppu.hpp
@@ -153,11 +153,13 @@ private:
     uint16 vcounter;
   } io;
 
+  #include "mosaic.hpp"
   #include "background.hpp"
   #include "object.hpp"
   #include "window.hpp"
   #include "screen.hpp"
 
+  Mosaic mosaic;
   Background bg1;
   Background bg2;
   Background bg3;
diff --git a/bsnes/sfc/ppu/serialization.cpp b/bsnes/sfc/ppu/serialization.cpp
index 777ca41d..30723a8a 100644
--- a/bsnes/sfc/ppu/serialization.cpp
+++ b/bsnes/sfc/ppu/serialization.cpp
@@ -73,6 +73,7 @@ auto PPU::serialize(serializer& s) -> void {
   s.integer(io.hcounter);
   s.integer(io.vcounter);
 
+  mosaic.serialize(s);
   bg1.serialize(s);
   bg2.serialize(s);
   bg3.serialize(s);
@@ -82,6 +83,11 @@ auto PPU::serialize(serializer& s) -> void {
   screen.serialize(s);
 }
 
+auto PPU::Mosaic::serialize(serializer& s) -> void {
+  s.integer(size);
+  s.integer(vcounter);
+}
+
 auto PPU::Background::serialize(serializer& s) -> void {
   s.integer(io.tiledataAddress);
   s.integer(io.screenAddress);
@@ -105,11 +111,8 @@ auto PPU::Background::serialize(serializer& s) -> void {
   s.integer(output.below.palette);
   s.integer(output.below.paletteGroup);
 
-  s.integer(mosaic.size);
   s.integer(mosaic.enable);
-  s.integer(mosaic.vcounter);
   s.integer(mosaic.hcounter);
-  s.integer(mosaic.voffset);
   s.integer(mosaic.hoffset);
 
   s.integer(mosaic.pixel.priority);