diff --git a/CMakeLists.txt b/CMakeLists.txt
index 423fd47..d440e31 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -114,7 +114,6 @@ if(NOT MSVC)
 		-Wall
 		#-Wextra  # TODO
 		#-Wshadow  # TODO
-		-Wno-sign-compare  # TODO
 		-Wno-multichar
 		-Wno-unknown-pragmas
 		-Werror=return-type
diff --git a/src/MTypes.h b/src/MTypes.h
index dd064d6..23cb1f8 100644
--- a/src/MTypes.h
+++ b/src/MTypes.h
@@ -6,13 +6,14 @@
 ///  John Stiles, 2002/10/14
 ///
 
+#pragma once
 
-#ifndef __MTYPES__
-#define __MTYPES__
-
+#include <cstdint>
 
 typedef signed char MBoolean;
 
+typedef uint32_t MTicks;
+
 
 struct MRGBColor
 {
@@ -42,5 +43,3 @@ void UnionMRect( const MRect* a, const MRect* b, MRect* u );
 void OffsetMRect( MRect* r, int x, int y );
 unsigned char MPointInMRect( MPoint p, MRect* r );
 
-
-#endif
diff --git a/src/control.cpp b/src/control.cpp
index 2aa67e4..b6a05df 100644
--- a/src/control.cpp
+++ b/src/control.cpp
@@ -14,7 +14,7 @@
 
 int destinationX[2], destinationR[2];
 signed char tempGrid[kGridAcross][kGridDown];
-int timeAI[2], timeMove[2];
+MTicks timeAI[2], timeMove[2];
 MBoolean moveQuick[2];
 AutoPatternPtr autoPattern = NULL;
 
diff --git a/src/control.h b/src/control.h
index 875e066..a86453e 100644
--- a/src/control.h
+++ b/src/control.h
@@ -17,7 +17,7 @@ void AutoControl( int player );
 
 extern int destinationX[2], destinationR[2];
 extern signed char tempGrid[kGridAcross][kGridDown];
-extern int timeAI[2];
+extern MTicks timeAI[2];
 extern MBoolean moveQuick[2];
 enum
 {
diff --git a/src/gameticks.cpp b/src/gameticks.cpp
index eac454d..b4551ac 100644
--- a/src/gameticks.cpp
+++ b/src/gameticks.cpp
@@ -3,10 +3,10 @@
 #include <SDL_timer.h>
 #include "gameticks.h"
 
-unsigned int  baseTickCount, freezeTickCount;
+MTicks baseTickCount, freezeTickCount;
 int freezeLevel;
 
-unsigned int  MTickCount()
+MTicks MTickCount()
 {
 	return (unsigned int ) ((float)SDL_GetTicks() * 0.06f);
 }
diff --git a/src/gameticks.h b/src/gameticks.h
index 9fcd08f..a5a4992 100644
--- a/src/gameticks.h
+++ b/src/gameticks.h
@@ -1,6 +1,8 @@
 // gameticks.h
 
-unsigned int  MTickCount();
+#include "MTypes.h"
+
+MTicks MTickCount();
 void InitGameTickCount( void );
 void FreezeGameTickCount( void );
 void UnfreezeGameTickCount( void );
diff --git a/src/graphics.cpp b/src/graphics.cpp
index dd6498c..491ca61 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -163,7 +163,7 @@ void ShowTitle( void )
 
     RetrieveResources( );
 
-    int time = MTickCount() + 120;
+    MTicks time = MTickCount() + 120;
 
     DrawPICTInSurface( g_frontSurface, picTitle );
 	while( time > MTickCount() && !SDLU_Button() )
diff --git a/src/grays.cpp b/src/grays.cpp
index 3f302ab..2f0ae58 100644
--- a/src/grays.cpp
+++ b/src/grays.cpp
@@ -20,7 +20,8 @@
 
 int grays[2][kGridAcross], grayAir[2][kGridAcross];
 int unallocatedGrays[2], lockGrays[2], rowBounce[2][kGridAcross], splat[2][kGridAcross];
-int blinkTime[2], blinkStage[2];
+MTicks blinkTime[2];
+int blinkStage[2];
 const int blinkList[] = { kGrayNoBlink, kGrayBlink1,  kGrayBlink2, 
   						  kGrayBlink3,  kGrayBlink2,  kGrayBlink1   };
 
diff --git a/src/grays.h b/src/grays.h
index dda50ea..76ac2fe 100644
--- a/src/grays.h
+++ b/src/grays.h
@@ -12,6 +12,7 @@ MBoolean BusyDroppingGrays( int player );
 
 extern int grays[2][kGridAcross], grayAir[2][kGridAcross], graySpeed[2];
 extern int unallocatedGrays[2], lockGrays[2], rowBounce[2][kGridAcross], splat[2][kGridAcross];
-extern int blinkTime[2], sunTime[2], blinkStage[2], sunStage[2];
+extern MTicks blinkTime[2];
+extern int blinkStage[2];
 
 #define kTimeBetweenBlinks 120
diff --git a/src/hiscore.cpp b/src/hiscore.cpp
index d39d55b..5203402 100644
--- a/src/hiscore.cpp
+++ b/src/hiscore.cpp
@@ -117,7 +117,8 @@ const char *highScoreRank;
 
 static void FadeScreen( SDL_Surface* hiScoreSurface, SDL_Surface* fadeSurface, int start, int end )
 {
-	int       skip, timer, frame, fade, color, direction, fadeStart, fadeEnd;
+	MTicks    timer;
+	int       skip, frame, fade, color, direction, fadeStart, fadeEnd;
 	SDL_Rect  destSDLRect;
 	SDL_Rect  fullSDLRect = { 0, 0, 640, 480 };
 	int       black;
diff --git a/src/level.cpp b/src/level.cpp
index 1f6482f..7cf3143 100644
--- a/src/level.cpp
+++ b/src/level.cpp
@@ -47,7 +47,7 @@ using std::max;
 
 const int startSkip = 1;
 static MBoolean shouldFullRepaint = false;
-static int startMenuTime = 0;
+static MTicks startMenuTime = 0;
 static int splatState[kNumSplats], splatColor[kNumSplats], splatSide[kNumSplats];
 static MRect splatBlob[kNumSplats];
 
@@ -1084,7 +1084,8 @@ void SharewareVictory( void )
 	MRect           bufferSrcRect = { 0, 50, 480, 350 };
 	MRect           bufferDstRect = { 0, 0, 480, 300 };
 	MPoint          dPoint = { 450, 50 }, lPoint, cPoint;
-	int             scroll, ticks, x, y;
+	int             scroll, x, y;
+	MTicks          ticks;
 	const char*     text;
 	int             thisFade;
 	const char fade[120] =   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //0
@@ -1215,7 +1216,7 @@ void RegisteredVictory( void )
 	MPoint          bubblePoint, textPoint, shadowPoint;
 	MPoint          setPoint[7][6];
 	MPoint          msgSetPoint[7][2];
-	int             ticks;
+	MTicks          ticks;
 	int             vertScroll, picture, weight, line, minimum;
 	int             scrollDir[] = {1, -1, 1, -1, 1, -1, -1};
 	int             spacing[] = {40, 19, 19, 19, 23, 19, 23 };
diff --git a/src/main.cpp b/src/main.cpp
index 26f4a28..43f5b5e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -288,7 +288,7 @@ signed char  nextA[2], nextB[2], nextM[2], nextG[2], colorA[2], colorB[2],
 	         blobX[2], blobY[2], blobR[2], blobSpin[2], speed[2], role[2], halfway[2],
 	         control[2], dropping[2], magic[2], grenade[2], anim[2];
 int          chain[2];
-int          blobTime[2], startTime, endTime;
+MTicks       blobTime[2], startTime, endTime;
 MBoolean     finished = false, pauseKey = false, showStartMenu = true;
 signed char  grid[2][kGridAcross][kGridDown], suction[2][kGridAcross][kGridDown], charred[2][kGridAcross][kGridDown], glow[2][kGridAcross][kGridDown];
 MRect        playerWindowZRect, playerWindowRect[2];
@@ -642,7 +642,7 @@ void QuickFadeIn( MRGBColor *color )
 	if (fullscreen) {
         for( float percent=0.0f; percent<1.0f; percent += 0.04f )
         {
-            int c = MTickCount( );
+            MTicks c = MTickCount( );
             SDLU_SetBrightness( percent );
             while( c == MTickCount( ) )
             {
@@ -663,7 +663,7 @@ void QuickFadeOut( MRGBColor *color )
 	if (fullscreen) {
         for( float percent=1.0f; percent>0.0f; percent -= 0.04f )
         {
-            int c = MTickCount( );
+            MTicks c = MTickCount( );
             SDLU_SetBrightness( percent );
             while( c == MTickCount( ) )
             {
diff --git a/src/main.h b/src/main.h
index 46c4e4e..73385a3 100644
--- a/src/main.h
+++ b/src/main.h
@@ -252,7 +252,7 @@ extern signed char nextA[2], nextB[2], nextM[2], nextG[2], colorA[2], colorB[2],
 	blobX[2], blobY[2], blobR[2], blobSpin[2], speed[2], role[2], halfway[2],
 	control[2], dropping[2], magic[2], grenade[2], anim[2];
 extern int chain[2];
-extern int blobTime[2], startTime, endTime;
+extern MTicks blobTime[2], startTime, endTime;
 extern MBoolean finished, pauseKey, showStartMenu;
 extern MBoolean fullscreen, widescreen, crispUpscaling;
 extern signed char grid[2][kGridAcross][kGridDown], suction[2][kGridAcross][kGridDown],
diff --git a/src/next.cpp b/src/next.cpp
index d8690ae..f486afd 100644
--- a/src/next.cpp
+++ b/src/next.cpp
@@ -20,7 +20,8 @@ SDL_Surface* nextDrawSurface;
 
 MRect nextWindowZRect, nextWindowRect[2];
 MBoolean nextWindowVisible[2] = {true, true};
-int nextTime[2][2], nextStage[2][2], pullA[2], pullB[2];
+MTicks nextTime[2][2];
+int nextStage[2][2], pullA[2], pullB[2];
 
 void InitNext( void )
 {
diff --git a/src/opponent.cpp b/src/opponent.cpp
index c7d862d..4ef645d 100644
--- a/src/opponent.cpp
+++ b/src/opponent.cpp
@@ -23,7 +23,8 @@ SDL_Surface* opponentDrawSurface;
 
 MRect opponentWindowZRect, opponentWindowRect;
 int opponentMood, opponentFrame;
-int opponentTime, glowTime[kGlows], glowFrame[kGlows], panicTime, panicFrame;
+MTicks opponentTime, glowTime[kGlows], panicTime;
+int glowFrame[kGlows], panicFrame;
 int heavyGlowArray[kGlowArraySize], glowArray[kGlowArraySize], lightGlowArray[kGlowArraySize];
 
 void InitOpponent( void )
diff --git a/src/opponent.h b/src/opponent.h
index 9c7fee5..bc4b40b 100644
--- a/src/opponent.h
+++ b/src/opponent.h
@@ -20,7 +20,8 @@ enum
 #define kGlowArraySize 30
 
 extern int opponentMood, opponentFrame;
-extern int opponentTime, glowTime[kGlows], glowFrame[kGlows], panicTime, panicFrame;
+extern MTicks opponentTime, glowTime[kGlows], panicTime;
+extern int glowFrame[kGlows], panicFrame;
 extern int glowArray[kGlowArraySize], lightGlowArray[kGlowArraySize];
 
 extern MRect opponentWindowZRect, opponentWindowRect;
diff --git a/src/pause.cpp b/src/pause.cpp
index cef377d..29f78a7 100644
--- a/src/pause.cpp
+++ b/src/pause.cpp
@@ -48,7 +48,8 @@ SkittlesFontPtr smallFont, bigFont, dashedLineFont, continueFont, tinyFont, bats
 FRGBColor backColor[4];
 MBoolean continueTimeOut;
 
-static int dialogType, dialogStage, dialogTimer, dialogTarget, dialogShade, dialogItem;
+static int dialogType, dialogStage, dialogTarget, dialogShade, dialogItem;
+MTicks dialogTimer;
 static float colorWrap = 0, colorInc;
 static MRect logoRect = {0, 0, 111, 246}, lastPauseRect;
 static MBoolean dialogStageComplete;
diff --git a/src/score.cpp b/src/score.cpp
index 4f6a6a9..4929f37 100644
--- a/src/score.cpp
+++ b/src/score.cpp
@@ -21,7 +21,8 @@ SDL_Surface* numberMaskSurface;
 
 MRect scoreWindowZRect, scoreWindowRect[2];
 MBoolean scoreWindowVisible[2] = {true, true};
-int roundStartScore[2], score[2], displayedScore[2], scoreTime[2];
+int roundStartScore[2], score[2], displayedScore[2];
+MTicks scoreTime[2];
 const char characterList[] = 
 { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
   'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
diff --git a/src/tutorial.cpp b/src/tutorial.cpp
index d26d821..4c3f6ec 100644
--- a/src/tutorial.cpp
+++ b/src/tutorial.cpp
@@ -315,7 +315,7 @@ SkittlesFontPtr balloonFont;
 MPoint          balloonPt;
 char*           balloonChar;
 char            balloonMsg[256];
-int             balloonTime, tutorialTime;
+MTicks          balloonTime, tutorialTime;
 SDL_Surface*    balloonSurface = NULL;
 
 void InitTutorial( void )
diff --git a/src/tutorial.h b/src/tutorial.h
index 3812d37..44549b8 100644
--- a/src/tutorial.h
+++ b/src/tutorial.h
@@ -24,7 +24,7 @@ typedef struct
 AutoPattern, *AutoPatternPtr;
 
 extern AutoPatternPtr autoPattern;
-extern int tutorialTime;
+extern MTicks tutorialTime;
 
 void InitTutorial( void );
 void StartBalloon( const char *message );
diff --git a/src/tweak.cpp b/src/tweak.cpp
index d39f52c..35ca4d8 100644
--- a/src/tweak.cpp
+++ b/src/tweak.cpp
@@ -10,7 +10,7 @@
 #include "graphics.h"
 #include "players.h"
 
-int  xTweakTime[2], yTweakTime[2], rTweakTime[2];
+MTicks xTweakTime[2], yTweakTime[2], rTweakTime[2];
 int yTweak[2], xTweak[2], xDirection[2], rTweak[2], rDirection[2];
 int lastShadow[2];
 int tweakOffsetX[4][11], tweakOffsetY[4][11];
diff --git a/src/victory.cpp b/src/victory.cpp
index 4fd8bc5..b476547 100644
--- a/src/victory.cpp
+++ b/src/victory.cpp
@@ -27,7 +27,7 @@
 #include <stdio.h>
 #include <string.h>
 
-unsigned int  winTime, loseTime;
+MTicks winTime, loseTime;
 int winStage, loseStage;
 float drop[kGridAcross], last[kGridAcross];
 SkittlesFontPtr victoryFont;
@@ -88,7 +88,7 @@ void BeginVictory( int player )
 
 void Lose( int player )
 {
-	int       gameTime = GameTickCount();
+	MTicks    gameTime = GameTickCount();
 	int       skip = 1;
 	MRect     boardRect;