Hiding games inside other games that are revealed only when insanely difficult additional quests have been completed is a great way for companies to reuse their old-school gaming outings. Just ask Nintendo; it’s been pimping out 2D Marios for years. But for this month’s list, XBN’s been busy unlocking the top-five coolest elderly games around.

1. Ninja Gaiden Ninja Gaiden (NES)

To unlock this old-school gem, collect all 50 scarabs.

2. Panzer Dragoon orta Panzer Dragoon (Sega Saturn)

After completing Panzer Dragoon Orta, you will be rewarded with this Sega Saturn classic.

3. Prince of Persia: the Sands of Time Prince of Persia (PC)

Once you complete The Sands of Time, take a trip back in time. Start a new game, stay on the balcony, press the left analog stick in, then quickly press A, X, Y, B, Y, A, X, B.

4. Pitfall: the Lost Expedition

Pitfall (Atari 2600)

One of the oldest games on this list will always stay a classic. At the Title screen, hold L trigger and R trigger, then press B, B, Left, Right, B, X, A, Up, B.

5. Spy Hunter Spy Hunter

(Atari 2600)

This radical game can be unlocked by entering OGSPY as a profile name.

Copyright © 2005 Ziff Davis Media Inc. All Rights Reserved. Originally appearing in Xbox Nation.