They enter the dream - level 1.
Level 2 - Entering the hotel.
Level 3 - Snow Fortress
Level 4 - The City
Ariadne shoves Fischer off the cliff.
Ariadne jumps.
Cobb enters limbo to look for Saito.
Snow fortress collapses - Level 3 Kick
Elevator bomb goes off - Level 2 Kick to 1
Van hits water - Level 1 kick to reality.
Cobb finds Saito - returns to reality from Limbo.