Don't Split Up (fourth attempt)

Summary
After getting caught hanging off a ledge, against Mark's suggestion, you fall down with Mark. Mark pulls out the device from the box and uses it to travel across parallel universes. After hopping through multiple realities, you and Mark end up right back at the museum entrance, with device broken. Annoyed that the trip was essentially for nothing, Mark leaves, ranting. You get the "Once More, With Feeling" ending and can play again.

Trivia

 * At 1:10, you and Mark appear in space, suggesting foreshadowing to In Space with Markiplier.