Your hard level (large) has too many solutions. I put in a perfectly valid solution, and it's marked as wrong even though there is nothing wrong with it. If you can fix the solutions so they are unique, I'll give it 5 stars.
Thanks for the feedback, I will look into this. The boards are generated in reverse and are checked on creation with a solver that that counts every solution - but only boards with one solution are supposed to be presented. Probably there is a bug with this.
The game is quite fun! The only thing you might want to do is give a hint in case people are stuck -- having only 1 try for the last puzzle scared me a little -- until I figured it out!
I really like the game. I would love to see some sort of Congrats message, or stay tuned for more. I'd also love to see some harder levels! Those were fun!
We had extracted the long version of colorzzle. We know some stages more explanation of the mechanism though. We'll make other version of this or new version think about that. Thanks for your comments. :)
Interesting game. Ok for those stuck with the 2 color clues -- I left the game on, took a nap and came back, and all of a sudden, just looking at the 2 colors, I SAW it! :)
On level 6 your last one is wrong, The pattern is heart heart circle heart heart ___ . if you fill in circle it marks it wrong.
Also I'd like to see more challenging levels
Certainly, this is just a few puzzles chosen to be very difficult (but appear easy). There is much bigger game, Codroids, that has 72 levels of increasing difficullty:
https://www.kongregate.com/games/BeardedWhale/codroids
I should probably make it clear in this challenge-version that there is a full version with a lot of warm up.
Ok so how I got the badge with the flashlight problem (of the game totally disappearing) -- I eventually figured out the game would reappear when I used the scrollbar on the side (of the browser!), so I would use that to make the game appear -- then I'd quickly (and this was the hard part) had to right click in the game window before the game disappeared again. Now fortunately when something highlighted (by right clicking), I could click anywhere to activate it... so I used that for timing . Immediately after clicking (left) on the screen, I had to right click again, or the game would disappear again. Good luck to everyone who is suffering now!
 "Circle Sudoku"){kind=icon}
 "Word Challenge"){kind=icon}
 "Wall Crack"){kind=icon}
 "Kitty Cat Hax"){kind=icon}
 "Shaft"){kind=icon}
 "colorzzle"){kind=icon}
 "It's Puzzle!"){kind=icon}
 "Magnetized 2"){kind=icon}
 "Squaregrams"){kind=icon}
 "PicRoad - Pixel art puzzle"){kind=icon}
 "What Comes Next?"){kind=icon}
 "Codroids Challenge"){kind=icon}
 "Blocks Deluxe"){kind=icon}
 "Math Games Free"){kind=icon}
 "Civiballs 2"){kind=icon}
 "Black and White Dimensions (HTML5)"){kind=icon}
Thanks for the feedback, I will look into this. The boards are generated in reverse and are checked on creation with a solver that that counts every solution - but only boards with one solution are supposed to be presented. Probably there is a bug with this.