Can You Solve The ESCAPE RIDDLE?

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3 friends woke up in a basement... Uyy! Looks like they’re not alone...
Austin: “Where are we?”
Barry: “We must’ve been kidnapped!”
George: "Let’s look around! There’s gotta be a clue or something.
Barry: “What the...a TV? Nothing...”
Austin: “Barry, light! Over here!”
George: “Let’s try...what do we have to lose!”
Congrats! You’re on a secret underground show! What? You didn’t sign up for this? Sucks to be you! Anyway... Soon you’ll either be cra$y rich, or... Listen up. There are 16 rooms. You’re in Room 1. Room 16 is the only exit. All rooms are connected by doors... You have to pass through ALL the rooms. If you do... you get $16 million, waaaa-hoooo! Once you leave a room, it fills with poisonous gas. You can’t go back to that room anymore! Oh, and no matter what you do... Room 1’s gonna fill with gas too...In 10 mins! Get going! So, how can you pass through each room and exit through Room 16? Actually... you can’t do it if you have an even number of rooms on each side! You can’t start in one corner and finish in the opposite corner...impossible