Stickman Boost! 2, an underground platformer, continues the adventures of the stickman from the first game in the series across 10 stages and two bonus stages. A player aids the stickman in completing runs through a variety of maze-like platform areas filled with dangerous obstacles, including spiked surfaces, flying bombs, falling platforms, serrated blades, glass walls, flame throwers, exploding bridges and conveyor belts.
The player must use the stickman's parkour and other skills to collect coins, bypass obstacles and reach checkpoints. They receive a lot of help along the way. Most of the platforms feature huge green arrows pointing out the correct paths to take in a maze. Floating black bubbles contain tools that can help them progress faster and survive, including rockets, hover boards, jet skis, jet packs, motorcycles, running blades and gliders. Some bubbles contain clocks that slow down the movement of traps on the platforms. The game also features automatically equipped options, such as incline zip lines and underwater scuba gear.
When the stickman reaches a checkpoint, the sign rotates or lights up. When they reach the finish line, they play an electric guitar. The player can then compare their time against best times, review the number of collected coins and stickman deaths and see if they received any gold stars as a reward.