Ascent

"Ascent" is a single-player horror platformer game with simple controls, where you roll a snowball up a mountain with no jumping, checkpoints, or forgiveness. The game's difficulty lies in its forcing players to push their cognitive abilities to the limit, with the risk of falling back down if not careful. With only thought-provoking dialogue from your snowball companion, your belief in yourself is what separates the player from the master.