Coin 18/32: The Shortcut - Nevada
Head into the barbershop to the right of the waterfall, and then go over to the counter to find this Coin.
Coin 19/32: The Shortcut - Colorado
Go over to the building opposite the phone shop and you'll find this Coin sitting on the roof outside of the window on the right.
Coin 20/32: The Descent - Illinois
Once you've gotten up after falling from the sky, dive into the pool to find this Coin.
Coin 21/32: The Descent - Oregon
Drop down three floors and take down the enemy that comes out of the wall, then jump across to the room behind you to find this Coin.
Coin 22/32: The Descent - Wisconsin
After you've exited the elevator, look to your left to find this Coin in the vending machine.
Coin 23/32: The Descent - Rhode Island
Once you've made it outside, go over to the bar and look behind the counter to find this Coin.
Coin 24/32: The Descent - Missouri
Upon reaching the Hospital, head into the Specialty Care Center building to find this Coin on the floor.
Coin 25/32: Ground Zero - Washington
Follow Nora until you reach an open room, then look behind the counter on the left to find this Coin.
Coin 26/32: Ground Zero - Hawaii
Upon defeating the Rat King, head out into the garage and look to your left to find this Coin in the guard post.