Stickhole.io is inspired by a very famous game Hole.io. For each level's boss battle, you command a traveling black hole that gathers stickmen. It's an untimed game with multiple levels.
Although it is an adaptation of the Hole.io game, this game is very engaging and has many unique innovations. You need to control a black hole in an arena.
The objective of the Stickhole.io game is to gather every stickman needed for the boss fight. When you control it to their feet, stickmen can be sucked up by your black hole. After that, you need to travel to the boss's location via the black hole. Bosses are vicious, hostile creatures. You have to beat him in order to pass the level. You need a vast army to do that because he is powerful and large in stature.