Color-a-Cube is a very fun and relaxing free to play game. Your first pack of coloring object is free, and what's nice is that you get to decide which pack you want to start with.

The game is like those color by numbers type of books where you have to put the right color to the indicated number. It is currently in early access, but it honestly already feels like a full game since I didn't encounter any bugs and the mechanics work very well.

They've recently added a new update that contains difficulty levels where the number of the color that you've selected won't highlight on the object. A new "Animal #2" pack was also just added. The devs also sometimes have events where they offer free new objects to claim during times like the holidays.

I'm not typically a casual player, but I don't know, this one really attracts me. I think that it's because of how simple it is, but at the same time, how well its made. I'm keeping an eye out for new updates because the devs, AlterEyes, is a studio that I really respect due to the fun and quality games that they've released so far. I have no doubt that their next project will be as fun.