Before leaving, interact with the red pills on the bowl near the cave exit for you to revisit the past. You'll unlock the Sprint Burst recipe during this sequence. Just order some drinks to complete your objective.
During your second trip, you have to find Riley next. Head downstairs and find the bathroom for a scene.
Once you're back in reality, exit the cave to complete the sequence and recieve a phone call from Willis.
I wouldn't think so because you have to complete one level to get to the next
can i do it at the end of the game?