diff --git a/parts/scenes/app_15p.lua b/parts/scenes/app_15p.lua
index 8c98ded2..f6a7b9ee 100644
--- a/parts/scenes/app_15p.lua
+++ b/parts/scenes/app_15p.lua
@@ -1,7 +1,7 @@
 local gc=love.graphics
 
 local int,rnd=math.floor,math.random
-local mStr=mStr
+local mStr=GC.mStr
 
 local scene={}
 
@@ -258,7 +258,7 @@ local backColor={
     },--Black
 }
 function scene.draw()
-    setFont(40)
+    FONT.get(40)
     gc.setColor(COLOR.Z)
     gc.print(("%.3f"):format(time),1026,80)
     gc.setColor(1,.8,.8)
@@ -282,7 +282,7 @@ function scene.draw()
 
     gc.setLineWidth(4)
     local mono=invis and state==1
-    setFont(80)
+    FONT.get(80)
     for i=1,4 do
         for j=1,4 do
             if cx~=j or cy~=i then
diff --git a/parts/scenes/app_2048.lua b/parts/scenes/app_2048.lua
index 290cc269..b3278181 100644
--- a/parts/scenes/app_2048.lua
+++ b/parts/scenes/app_2048.lua
@@ -4,8 +4,8 @@ local setColor,rectangle=gc.setColor,gc.rectangle
 local int,abs=math.floor,math.abs
 local rnd,min=math.random,math.min
 local ins=table.insert
-local setFont=setFont
-local mStr=mStr
+local setFont=FONT.get
+local mStr=GC.mStr
 
 local scene={}
 
diff --git a/parts/scenes/app_AtoZ.lua b/parts/scenes/app_AtoZ.lua
index df9dbffa..f97f8603 100644
--- a/parts/scenes/app_AtoZ.lua
+++ b/parts/scenes/app_AtoZ.lua
@@ -1,6 +1,5 @@
 local gc=love.graphics
 local rnd=math.random
-local mStr=mStr
 
 local levels={
     A_Z="ABCDEFGHIJKLMNOPQRSTUVWXYZ",
@@ -83,7 +82,7 @@ function scene.update()
 end
 
 function scene.draw()
-    setFont(40)
+    FONT.get(40)
     gc.setColor(COLOR.Z)
     gc.print(("%.3f"):format(time),1026,80)
     gc.print(mistake,1026,150)
@@ -100,15 +99,15 @@ function scene.draw()
         gc.setColor(.2,.8,.2)--ready
     end
 
-    setFont(100)
-    mStr(state==1 and #targetString-progress+1 or state==0 and"Ready"or state==2 and"Win",640,200)
+    FONT.get(100)
+    GC.mStr(state==1 and #targetString-progress+1 or state==0 and"Ready"or state==2 and"Win",640,200)
 
     gc.setColor(COLOR.Z)
     gc.print(targetString:sub(progress,progress),120,280,0,2)
     gc.print(targetString:sub(progress+1),310,380)
 
     gc.setColor(1,1,1,.7)
-    setFont(40)
+    FONT.get(40)
     gc.print(targetString,120,520)
 end
 
diff --git a/parts/scenes/app_UTTT.lua b/parts/scenes/app_UTTT.lua
index ce3face3..f9003824 100644
--- a/parts/scenes/app_UTTT.lua
+++ b/parts/scenes/app_UTTT.lua
@@ -171,7 +171,7 @@ function scene.draw()
 
     if gameover then
         --Draw result
-        setFont(60)
+        FONT.get(60)
         if gameover==0 then
             gc.setColor(1,.6,.6)
             mStr("RED\nWON",1140,200)
diff --git a/parts/scenes/app_arithmetic.lua b/parts/scenes/app_arithmetic.lua
index 510de686..31b414ed 100644
--- a/parts/scenes/app_arithmetic.lua
+++ b/parts/scenes/app_arithmetic.lua
@@ -189,17 +189,17 @@ function scene.update(dt)
     end
 end
 function scene.draw()
-    setFont(35)
+    FONT.get(35)
     gc.setColor(COLOR.Z)
-    mStr("["..level.."]",640,30)
+    GC.mStr("["..level.."]",640,30)
 
-    setFont(100)
+    FONT.get(100)
     if type(question)=='table'then gc.setColor(1,1,1)end
-    mStr(question,640,60)
+    GC.mStr(question,640,60)
 
-    setFont(80)
+    FONT.get(80)
     gc.setColor(1,1,1,inputTime)
-    mStr(input,640,160)
+    GC.mStr(input,640,160)
 end
 
 scene.widgetList={
diff --git a/parts/scenes/app_calc.lua b/parts/scenes/app_calc.lua
index 92f50e69..572f86c3 100644
--- a/parts/scenes/app_calc.lua
+++ b/parts/scenes/app_calc.lua
@@ -114,10 +114,10 @@ function scene.draw()
     gc.setColor(COLOR.Z)
     gc.setLineWidth(2)
     gc.rectangle('line',100,80,650,150,5)
-    setFont(45)
+    FONT.get(45)
     if reg then gc.printf(reg,0,100,720,'right')end
     if val then gc.printf(val,0,150,720,'right')end
-    if sym then setFont(50)gc.print(sym,126,150)end
+    if sym then FONT.get(50)gc.print(sym,126,150)end
 end
 
 scene.widgetList={
diff --git a/parts/scenes/app_cannon.lua b/parts/scenes/app_cannon.lua
index 31818b8d..2d72bb49 100644
--- a/parts/scenes/app_cannon.lua
+++ b/parts/scenes/app_cannon.lua
@@ -103,7 +103,7 @@ function scene.draw()
     end
 
     --Info
-    setFont(40)
+    FONT.get(40)
     if combo>1 then
         gc.setColor(1,1,.6)
         gc.print("x"..combo,300,80)
diff --git a/parts/scenes/app_cubefield.lua b/parts/scenes/app_cubefield.lua
index 05444749..3af843e0 100644
--- a/parts/scenes/app_cubefield.lua
+++ b/parts/scenes/app_cubefield.lua
@@ -1,10 +1,7 @@
-local gc=love.graphics
-local kb=love.keyboard
-local tc=love.touch
-
+local gc,kb,tc=love.graphics,love.keyboard,love.touch
 local rnd,int,abs=math.random,math.floor,math.abs
 local max,min=math.max,math.min
-local setFont=setFont
+local setFont,mStr=FONT.get,GC.mStr
 
 local cubeColor={
     {.88,.75,.00},
diff --git a/parts/scenes/app_dropper.lua b/parts/scenes/app_dropper.lua
index 6729d264..a3c5d1b1 100644
--- a/parts/scenes/app_dropper.lua
+++ b/parts/scenes/app_dropper.lua
@@ -1,10 +1,11 @@
 local gc=love.graphics
-local rnd=math.random
-local int,max=math.floor,math.max
+local rnd,int,max=math.random,math.floor,math.max
+local setFont,mStr=FONT.get,GC.mStr
 
 --This mini-game is written for TI-nSpire CX CAS many years ago.
 --Deliberately, some grammar mistakes and typos in the 'great' list remained.
 --So no need to correct them.
+
 local perfect={"Perfect!","Excellent!","Nice!","Good!","Great!","Just!","300"}
 local great={"Pay attention!","Be carefully!","Teacher behind you!","Feel tired?","You are in danger!","Do your homework!","A good game!","Minecraft!","y=ax^2+bx+c!","No music?","Internet unavailable.","It's raining!","Too hard!","Shorter?","Higher!","English messages!","Hi!","^_^","Drop!","Colorful!",":)","100$","~~~wave~~~","★★★","中文!","NOW!!!!!","Also try the TEN!","I'm a programer!","Also try minesweeperZ!","This si Dropper!","Hold your calculatoor!","Look! UFO!","Bonjour!","[string]","Author:MrZ","Boom!","PvZ!","China!","TI-nspire!","I love LUA!"}
 local miss={"Oops!","Uh-oh","Ouch!","Oh no."}
diff --git a/parts/scenes/app_dtw.lua b/parts/scenes/app_dtw.lua
index 9dee2ed4..c793abc5 100644
--- a/parts/scenes/app_dtw.lua
+++ b/parts/scenes/app_dtw.lua
@@ -1,4 +1,5 @@
 local gc=love.graphics
+local setFont,mStr=FONT.get,GC.mStr
 
 local int,rnd=math.floor,math.random
 local ins,rem=table.insert,table.remove
diff --git a/parts/scenes/app_link.lua b/parts/scenes/app_link.lua
index c3ed84e0..c849d435 100644
--- a/parts/scenes/app_link.lua
+++ b/parts/scenes/app_link.lua
@@ -2,7 +2,7 @@ local ms=love.mouse
 local msIsDown,kbIsDown=ms.isDown,love.keyboard.isDown
 local gc=love.graphics
 local gc_setColor,gc_rectangle,gc_draw=gc.setColor,gc.rectangle,gc.draw
-local setFont=setFont
+local setFont,mStr=FONT.get,GC.mStr
 
 local int,rnd,abs=math.floor,math.random,math.abs
 local max,min=math.max,math.min
diff --git a/parts/scenes/app_polyforge.lua b/parts/scenes/app_polyforge.lua
index 7f9193eb..c31a4888 100644
--- a/parts/scenes/app_polyforge.lua
+++ b/parts/scenes/app_polyforge.lua
@@ -1,5 +1,7 @@
 local gc=love.graphics
 local rnd,sin,cos=math.random,math.sin,math.cos
+local setFont,mStr=FONT.get,GC.mStr
+
 local tau=math.pi*2
 
 local state
diff --git a/parts/scenes/app_pong.lua b/parts/scenes/app_pong.lua
index 5d566c29..aef286fc 100644
--- a/parts/scenes/app_pong.lua
+++ b/parts/scenes/app_pong.lua
@@ -151,10 +151,10 @@ end
 
 function scene.draw()
     --Draw score
-    setFont(100)
     gc.setColor(.4,.4,.4)
-    mStr(p1.score,470,20)
-    mStr(p2.score,810,20)
+    FONT.get(100)
+    GC.mStr(p1.score,470,20)
+    GC.mStr(p2.score,810,20)
 
     --Draw boundary
     gc.setColor(COLOR.Z)
diff --git a/parts/scenes/app_reflect.lua b/parts/scenes/app_reflect.lua
index 14d114fc..e722d683 100644
--- a/parts/scenes/app_reflect.lua
+++ b/parts/scenes/app_reflect.lua
@@ -1,5 +1,6 @@
 local gc=love.graphics
 local rnd=math.random
+local setFont,mStr=FONT.get,GC.mStr
 
 local scene={}
 
diff --git a/parts/scenes/app_schulteG.lua b/parts/scenes/app_schulteG.lua
index c4ef1084..ec346a3b 100644
--- a/parts/scenes/app_schulteG.lua
+++ b/parts/scenes/app_schulteG.lua
@@ -1,10 +1,7 @@
-local gc=love.graphics
-local ms=love.mouse
-
+local gc,ms=love.graphics,love.mouse
 local int,rnd=math.floor,math.random
 local rem=table.remove
-local setFont=setFont
-local mStr=mStr
+local setFont,mStr=FONT.get,GC.mStr
 
 local scene={}
 
diff --git a/parts/scenes/app_tap.lua b/parts/scenes/app_tap.lua
index 1e03209c..e99db293 100644
--- a/parts/scenes/app_tap.lua
+++ b/parts/scenes/app_tap.lua
@@ -1,7 +1,7 @@
 local gc=love.graphics
 local max=math.max
 local ins=table.insert
-local mStr=mStr
+local setFont,mStr=FONT.get,GC.mStr
 
 local scene={}
 
diff --git a/parts/scenes/app_ten.lua b/parts/scenes/app_ten.lua
index d7f808f4..a39fb463 100644
--- a/parts/scenes/app_ten.lua
+++ b/parts/scenes/app_ten.lua
@@ -4,11 +4,12 @@ local setColor,rectangle=gc.setColor,gc.rectangle
 
 local int,rnd=math.floor,math.random
 local ins,rem=table.insert,table.remove
-local mStr=mStr
+local setFont,mStr=FONT.get,GC.mStr
 
 local scene={}
 
 local previewX={245,186,129,78,35}
+local previewY={435,442,449,456,463}
 local tileColor={
     {.39, 1.0, .39},
     {.39, .39, 1.0},
@@ -246,7 +247,7 @@ function scene.draw()
         for i=1,5 do
             setFont(85-10*i)
             gc.setColor(tileColor[preview[i]])
-            gc.print(preview[i],previewX[i],428+i*7)
+            gc.print(preview[i],previewX[i],previewY[i])
         end
     end
 
@@ -257,8 +258,8 @@ function scene.draw()
     end
     gc.setLineWidth(10)
     setColor(COLOR[
-        state==0 and'G'or
         state==1 and(fast and'R'or'W')or
+        state==0 and'G'or
         state==2 and'Y'
     ])
     rectangle('line',315,35,650,650)