There is a time machine in the space ship.
It works by sitting on it and something running on the hamster wheel.
This is the low-spoiler guide for "Getting the time machine to work" puzzle in Justin Wack and the Big Time Hack. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.