Great puzzler. It's not difficult (there's hints also) but levels get tricky if the pieces are not moved right. Sometimes they get "stuck" on an edge by a tiny bit so it requires an extra move to fix (this is an absoute PAIN on challenge mode).
There was some frustration for the first/second time playing the later levels, but the walkthrough is solid and can be checked if really stuck. Achieving 3+ stars is not impossible either.
But, this may present some extra challenge for colorblind folks, I don't know...
Still, great game! Good to see people had good taste back in '11.
On levels like level 3 after removing the green stamp/T piece and the white stamp/T piece they didn't disappear and now float endlessly supposedly still a part of the puzzle. As annoying as this is to deal with + HerbieG's comment this game feels like it would be that much more frustrating without fun. So like Lori Greiner says, "I'm out".
Got stuck on lv9
The idea for the game is great by itself, but the game has one super-annoying bug that ruins it. It may happen that while playing the level the pieces will simply get stucked one in another and the level becomes unsolvable. It is possible to "unbug" some of them, but still some of them are so stucked that you have to replay the whole level. If it was one of the easier ones - no big deal, but if it is one of those more complicated ones... Whole star taken away because of that issue.