diff --git a/combinators.nim b/combinators.nim
index 903d1a7..cc8a09d 100644
--- a/combinators.nim
+++ b/combinators.nim
@@ -1,5 +1,5 @@
 import algorithm, random, sugar
-import fixedseq, game
+import faststack, fixedseq, game
 
 
 proc nextPermutation(x: var FixedSeq): bool =
diff --git a/faststack.nim b/faststack.nim
index e6d5c63..12e2f04 100644
--- a/faststack.nim
+++ b/faststack.nim
@@ -6,12 +6,12 @@ proc show(i: SomeInteger, bitlength = 16) =
 
 
 type
-  Color = enum
+  Color* = enum
     cRed, cGreen, cBlue, cYellow, cPurple
 
-  ColorStack = object
+  ColorStack* = object
     data: uint16
-    len: uint8
+    len*: uint8
 
 
 const
@@ -23,6 +23,7 @@ const
     0b0_000_111_111_111_111,
     0b0_111_111_111_111_111,
   ]
+  allColors* = ColorStack(len: 5, data: 0b0_000_001_010_011_100)
 
 
 template offset(s: ColorStack, idx: Natural): uint8 =
@@ -39,7 +40,7 @@ template offset(s: ColorStack, idx: BackwardsIndex): uint8 =
   (cast[uint8](idx) - 1) * 3
 
 
-proc add(s: var ColorStack, c: Color) =
+proc add*(s: var ColorStack, c: Color) =
   # e.g. if stack is 0b0000000000000100:
   # and color is 0b00000011
   # shift: 0b0000000000100000
@@ -49,50 +50,53 @@ proc add(s: var ColorStack, c: Color) =
   inc s.len
 
 
-proc high(s: ColorStack): uint8 = s.len - 1
+proc high*(s: ColorStack): uint8 = s.len - 1
 
-proc low(s: ColorStack): uint8 = 0 # just... always 0, I guess
+proc low*(s: ColorStack): uint8 = 0 # just... always 0, I guess
 
 
-proc `[]`(s: ColorStack, i: uint8 | BackwardsIndex): Color =
+proc `[]`*(s: ColorStack, i: uint8 | BackwardsIndex): Color =
   # shift, then mask everything but the three rightmost bits
   result = cast[Color](
     (s.data shr s.offset(i)) and masks[1]
   )
 
 
-proc `[]=`(s: var ColorStack, i: uint8 | BackwardsIndex, c: Color) =
+proc `[]=`*(s: var ColorStack, i: uint8 | BackwardsIndex, c: Color) =
   let offset = s.offset(i)
   s.data = (s.data and bitnot(masks[1] shl offset)) or (cast[uint16](c) shl offset)
 
 
-iterator items(s: ColorStack): Color =
+iterator items*(s: ColorStack): Color =
   # s.len is unsigned so it will wrap around if we do s.len - 1 in that case
   if s.len != 0:
     for i in countdown(s.len - 1, 0'u8):
       yield cast[Color]((s.data shr (i * 3)) and masks[1])
 
 
-iterator pairs(s: ColorStack): (int, Color) =
-  var count = 0
+iterator pairs*(s: ColorStack): (uint8, Color) =
+  var count = 0'u8
   for color in s:
     yield (count, color)
     inc count
 
 
-proc find(s: ColorStack, needle: Color): uint8 =
+proc find*(s: ColorStack, needle: Color): uint8 =
   for i in 0'u8 .. s.high:
     if s[i] == needle:
       return i
 
 
-proc moveSubstack(src, dst: var ColorStack, nToMove: uint8) =
+proc moveSubstack*(src, dst: var ColorStack, startIdx: uint8) =
   # Moves a sub-stack from the top of src to the top of dst
   # shift the dst stack by the length of the substack to make room
+  let nToMove = src.len - startIdx
   let shift = nToMove * 3
   dst.data = dst.data shl shift
   # then we mask the source data to present only the items 
   # being moved, and OR that with the shifted dst data
+  if src.len > 5:
+    echo src.len
   dst.data = dst.data or (src.data and masks[src.len])
   dst.len += nToMove
   # then we shift the source to get rid of the moved items
@@ -100,8 +104,9 @@ proc moveSubstack(src, dst: var ColorStack, nToMove: uint8) =
   src.len -= nToMove
 
 
-proc moveSubstackPre(src, dst: var ColorStack, nToMove: uint8) =
+proc moveSubstackPre*(src, dst: var ColorStack, startIdx: uint8) =
   # Moves a sub-stack from the top of src to the bottom of dst
+  let nToMove = src.len - startIdx
   # shift src stack to position substack above its destination,
   # get rid of everything to the left of the substack,
   # and OR that with the existing dst data
@@ -112,7 +117,7 @@ proc moveSubstackPre(src, dst: var ColorStack, nToMove: uint8) =
   src.len -= nToMove
 
 
-proc swap(s: var ColorStack, i1, i2: uint8) =
+proc swap*(s: var ColorStack, i1, i2: uint8) =
   # Swap the values at two indices in the stack
   if i1 == i2: return
 
@@ -134,7 +139,7 @@ proc swap(s: var ColorStack, i1, i2: uint8) =
   s.data = (s.data and mask.bitnot) or swapped
 
 
-proc shuffle(r: var Rand, s: var ColorStack) =
+proc shuffle*(r: var Rand, s: var ColorStack) =
   # Fisher-Yates shuffle
   for i in countdown(s.high, 1'u8):
     let j = cast[uint8](r.rand(i))
@@ -142,7 +147,7 @@ proc shuffle(r: var Rand, s: var ColorStack) =
       s.swap(i, j)
 
 
-proc reverse(s: var ColorStack, first, last: uint8) =
+proc reverse*(s: var ColorStack, first, last: uint8) =
   var x = first
   var y = last
   while x < y:
@@ -151,10 +156,12 @@ proc reverse(s: var ColorStack, first, last: uint8) =
     dec y
 
 
-proc asInt(s: ColorStack): uint16 = s.data
+iterator asInt*(s: ColorStack): int8 =
+  for i in 0'u8 .. s.high:
+    yield int8(s[i]) # now we do have to convert
 
 
-proc `$`(s: ColorStack): string =
+proc `$`*(s: ColorStack): string =
   result = "St@["
   for c in s:
     if result[^1] != '[':
@@ -171,27 +178,9 @@ one.add(cYellow)
 one.add(cPurple)
 
 var two: ColorStack
-# two.add(cPurple)
-two.add(cRed)
-# two.add(cYellow)
 
-echo "one: ", one
-# echo "two: ", two
+one.moveSubstack(two, 2)
+two.moveSubstackPre(one, 1)
 
-one.reverse(0, 4)
-echo "one: ", one
-# one[^2] = cPurple
-# echo "one: ", one
-
-# echo "one 0: ", one[0]
-# echo "one 2: ", one[2]
-# echo "one 3: ", one[3]
-
-# echo "one ^1: ", one[^1]
-# echo "one ^2: ", one[^2]
-# echo "one ^4: ", one[^4]
-
-# echo "<move>"
-# moveSubstack(one, two, 2)
-# echo "one: ", one
-# echo "two: ", two
\ No newline at end of file
+echo one, " ", one.len
+echo two, " ", two.len
diff --git a/game.nim b/game.nim
index f6e8d8a..dcb51ad 100644
--- a/game.nim
+++ b/game.nim
@@ -1,25 +1,26 @@
 import hashes, options
-import fixedseq
+import fixedseq, faststack
+
+export faststack.Color, faststack.ColorStack, faststack.allColors
 
 
-type
-  Color* = enum
-    cRed, cGreen, cBlue, cYellow, cPurple
+# type
+#   Color* = enum
+#     cRed, cGreen, cBlue, cYellow, cPurple
 
-  ColorStack* = FixedSeq[5, Color, int8]
+#   ColorStack* = FixedSeq[5, Color, int8]
 
 
-proc initColorStack*: ColorStack =
-  result.initFixedSeq
+# proc initColorStack*: ColorStack =
+#   result.initFixedSeq
 
 
-proc getAllColors: ColorStack = 
-  var i = 0
-  for c in Color.low .. Color.high:
-    result[i] = c
+# proc getAllColors: ColorStack = 
+#   var i = 0'u8
+#   for c in Color.low .. Color.high:
+#     result[i] = c
 
-const 
-  allColors* = getAllColors()
+const
   colorNames: array[Color, string] =
     ["Red", "Green", "Blue", "Yellow", "Purple"]
   colorAbbrevs: array[Color, char] = ['R', 'G', 'B', 'Y', 'P']
@@ -82,8 +83,8 @@ proc hash*(b: Board): Hash =
 
 
 proc init*(b: var Board) =
-  for sq in b.squares.mitems:
-    sq.camels.initFixedSeq
+  # for sq in b.squares.mitems:
+  #   sq.camels.initFixedSeq
   b.initialized = true
 
 
@@ -112,7 +113,7 @@ proc setState*(b: var Board;
   b.leader = some(leadCamel)
 
 
-proc diceRemaining*(b: Board): ColorStack =
+proc diceRemaining*(b: Board): FixedSeq[5, Color, int8] =
   result.initFixedSeq
   for color, isRolled in b.diceRolled:
     if not isRolled: result.add(color)
@@ -144,7 +145,7 @@ proc advance*(b: var Board, die: Die) =
   if prepend:
     b[startPos].camels.moveSubstackPre(b[endPos].camels, stackStart)
     let stackLen = b[startPos].camels.len - stackStart
-    for i in 0 ..< stackLen:
+    for i in 0'u8 ..< stackLen:
       # we know how many camels we added to the bottom, so set the position for each of those
       b.camels[b[endPos].camels[i]] = endPos
   else:
diff --git a/simulation.nim b/simulation.nim
index 96d6fc1..51b78e8 100644
--- a/simulation.nim
+++ b/simulation.nim
@@ -38,7 +38,7 @@ proc percents*(scores: ScoreSet): WinPercents =
 # ======================
 
 iterator legEndStates(b: Board): Board =
-  var diceRemaining: ColorStack
+  var diceRemaining: FixedSeq[5, Color, int8]
   diceRemaining.initFixedSeq
   for i, c in b.diceRolled:
     if not c: diceRemaining.add(i)
diff --git a/test.nim b/test.nim
index b317c6c..cceb761 100644
--- a/test.nim
+++ b/test.nim
@@ -94,7 +94,7 @@ proc testSpread(nTests, nSamples: Natural) =
 
 
 when isMainModule:
-  games(100, 1_000_000).summarize()
+  games(10, 1_000_000).summarize()
   # let start_states = 2_000
   # let executionTime = testLegs(start_states)
   # echo "Execution time: ", executionTime
diff --git a/ui.nim b/ui.nim
index 5575d59..a1b044e 100644
--- a/ui.nim
+++ b/ui.nim
@@ -1,5 +1,5 @@
 import os, math, strutils, strformat
-import fixedseq, game, simulation
+import faststack, fixedseq, game, simulation
 
 
 const help =