Fun Dungeon is inside Excalibur Hotel. It is a dungeon because you have to go down the stairs. It's in the same area as King's Tournament theater. I find this place clean, smoke free, and staff are very helpful. It can get busy and chaotic but staff here are very patient especially prize redeeming area. Kudos to the staff!
They have variety of arcade games to carnival games where you can win stuff animals. All the machines takes quarters. So you don't have to hassle with tokens.