Simple in rules, but difficult in execution, the game Ink Jump invites you to test your reaction. The task is to jump on platforms that lead up. You need to climb as high as possible. When you jump, the black arrow will leave an ink trail behind you that will not disappear. This way you will see all attempts to jump onto the next platform, and if there are several of them, the field will literally be flooded with ink. The ink is probably used specifically to help you improve your jumps in Ink Jump.
