Trace your steps back to the same stairway that you used to get up to the Fountain, and follow the path once more until you come across another Slot Machine proprietor hanging out in front the architectures adorned with Playing cards.
The crook will tell you that a special card was stolen from him and taken into the Card House; agree to help him out, then Reptile Rush up the newly raised ramp. Aim to snag all five tokens on the way in. Watch out for the shifting shock traps that can get you the moment you Reptile Rush through the cracked glass pane. Proceed inside the card house, where there will be a tower of class cubes with a special card on the top of it.
Reptile Rush through all seven glass encasements to get the special card, while evading enemies who will try to impede you, return the card to the slot machine to win another five tokens, getting a total of 10.