Best done on 2 player. Get 1 player to run around distracting Kenny as the other shoots kenny.

When Kenny is Knocked out, run over to the levers to the right of him and pull them down.

Repeat this prosess again, ( one lever box aint open kenny will open it eventually ) as soon as hes Knocked out, run over and pull those levers down.

Knock him out again, Pick the lock on the last box, and pull those levers down on the next given opportunity.

Now Shannon has to breath on the last and final box, she can do this as Stan is running around distracting.

Congratulations after pulling the leaver down game completed.