Refactored board creation

board.lua

@@ -68,6 +68,7 @@ function Board.new()
 		end,
 
 		fill = function(self, idx, color, invert)
+			if idx > width*width then return end
 			if invert then
 				color = color == YELLOW and BLUE or YELLOW
 			end

states/game.lua

@@ -23,11 +23,17 @@ function stateGame()
 		printh("b: " .. time())
 		-- Remove tiles until randomness is unavoidable
 		local previous = {board:getTilesCopy()} -- initial state
-		local invalidcount = 0
+		local i = 0
 		while true do
 			board:setTiles(previous[#previous])
 			-- remove a random tile
-			local i = board:getRandomNonZero()
+			repeat
+				i += 1
+			until i == 100 or board:getTilesCopy()[i] ~= 0
+			if i == 100 then
+				break
+			end
+
 			board:fill(i, 0)
 			add(previous, board:getTilesCopy())
 
@@ -37,15 +43,8 @@ function stateGame()
 			repeat
 				solved = board:solveStep()
 			until board:isComplete() or solved == "invalid"
-			if board:isComplete() then
-				invalidcount = 0
-			end
 			if solved == "invalid" then
 				deli(previous)
-				invalidcount += 1
-			end
-			if invalidcount > 50 then
-				break
 			end
 		end -- end while
 		printh("c: " .. time())
@@ -56,7 +55,7 @@ function stateGame()
 	end
 
 	local function _enter()
-		local c = cocreate(create_board)
+		cocreate(create_board)
 	end
 
 	local function _draw()