Arkedo Series

Pixel mini-games are hidden blocks with exclamation mark on them. To access a mini-game, zoom on the block by holding  then push . Finish it in time and you should get your health fully replenished. Otherwise, you will lose some health. There are a lot of these in the game but as long as you take your time to explore, you will find them.

Note: If you die after finishing a mini-game but before reaching a checkpoint, you will have to redo it.