Boost Up

Boost Up is an option from Fleeing the Complex that appears at the start of the game.

After Grigori Olyat sends Henry to wait for his cell alongside Ellie Rose, Henry Stickmin asks her to boost him up while Grigori is not paying attention. If chosen, Ellie will then boost Henry up, who manages to reach the hatch and enter the vent, finding a rock to break the cuffs.

Henry can decide to either continue his escape alone or bring Ellie along with him, which leads to either the Convict Allies or Ghost Inmate endings respectively. The choice in the maintenance vent, which is after the same option, is a fork.

Trivia

 * This is the only instance in The Henry Stickmin Collection where two forks appear consecutively.