The X-Room normally shows nothing but darkness and a grey pillar in the middle of the room. But there is a reason for the mysterious X-Room's existence...a hidden game!
In the X-Room, press R1, R2, L1, L2, Up, and Triangle all at the same time. The screen will flash and a noise will be heard. A woman will suddenly appear to the right of the pillar (The same woman that appears on the "X-Room" sign...and also on the Assault Plus game card.) Go to the woman until Pac-Man gains attention ("!") and press X. The woman will make some pose and will point you to the direction of the pillar, where a static screen that says "ASSAULT PLUS" is hovering over. Press X in front of it, and the room will change into a small stadium; the pillar will be converted to the Assault Plus cabinet!
There are also two exhibits and complementary How to Play and Tip screens for the game near the doorway.
Effect Code Hidden Game Enter the Museum and go to the Return of Ishtar room. Then press Right, Left, Up, Down, Circle.
Contributed By: KasketDarkfyre.
The robot receptionist you meet at the beginning can be changed into a human! When Pac-Man gains attention of the receptionist ("!"), press Triangle to look up, and then press X. When looking down (by pressing Square), the receptionist has changed! While the functionality of the receptionist is no different, the human receptionist will have a few different animations that make her...well, more human.
Doing the same trick while the human receptionist is available will revert her to the robot.
Hold all the L and R buttons as soon as you power up the game. Keep them held down and you'll see a secret video of Japanese shows and cartoons.
Contributed By: freakunique.
First, make sure you're in Round 2. Move a tree stump (There's only one in the level that you can move) and you will warp to Trip 3 Round 9, and earn an additional 80,000 points (Arcade and Atari Lynx versions only).
Contributed By: Mega Man 5.
The Return of Ishtar Cheats
Last Level Password
At the title screen, select "Password". Enter your name as "AAA" for both characters. Then select "MALE" for both characters and choose "Ki & Gil". Now for the left password enter "PDU5JT" and for the right password enter "X7JJ". If done right, you'll be able to select the last level from the stage list.
Contributed By: ReyVGM.
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