Obstacles are a barrier that must be bypassed by players to continue. Use up the players resources, highlight special equipment or push them to explore further.

d8	Obstacle
1	Locked door. Key can be found in another room. Knocking the door down takes time and makes noise.
2	Steep climb. Without special equipment, mice risk exhaustion or falling.
3	Room with an exit in the centre of the roof, 6" away from any wall.
4	Device that creates an high-pitched scream. Each Turn spent here or in adjacent rooms gives Frightened Condition.
5	Caved-in section of tunnel, leaving a gap too small to crawl through.
6	Tunnel completely filled with water.
7	Wide, deep puddle of mud blocking the way. Gives an Exhausted Condition per 6" traveled.
8	Long, smooth, upwards sloping metal or plastic tube.