Tall.io Tall.io is an addicting IO game where you need to help a powerful stickman grow as tall as possible. Collect all of the bricks of your color to grow taller while picking up all of the power-ups you come across to get faster. Roam around the map, destroy trees, and go through different color gates that can either decrease or increase your size. Green gates and balloons will increase your height while red gates will decrease it. Try and avoid all of the obstacles in your path and any stickman that are taller than you. Keep climbing up the leaderboards and become the tallest stickman in the arena!