Boulder Run (RB Battles)

Boulder Run is one of the minigames in the RB Battles game.

Gameplay
Players must run through an obstacle course while running from a giant mouthed purple boulder. You can slide under obstacles by pressing the Shift or the C key. The obstacle course seems to be a ruined city with holes, metal bars and buildings. Once the players reach the end, they enter what seems to be the spaceship in the lobby. The first player to the finish wins.

Trivia
Inside the spaceship at the end used to be the Sword Shrine. It could be seen when zooming out with your camera while spectating someone. This was later removed due to unknown reasons, probably because it would spoil the location of the actual Shrine.