RGB logic is a bit like a colorful, simpler Sudoku (but it can actually be really tricky). Simply arrange the colors so there is one of each in every row and column and the arrangement matches the clues on the outside.
A tutorial gently introduces the rules of the game.
There are 10 brand new free puzzles of varying difficulty every day.
You can share any puzzle (even with people who dont have the App yet).
There are also modes called 18, 24 and 50 where you have precisely that number of moves and a ticking clock to solve puzzles. Just one mistake and you wont be able to complete the puzzle.
A one off in app purchase unlocks the full set of 20 puzzles every day and the 24 and 50 modes.