Metal Slug Anthology on the PSP, there is no traditional "Cheat" menu built into the game's start screen like in some modern titles. Instead, unlocking the full experience involves a mix of button-sequence codes glitch-based farming emulator-specific hacks for those playing via PPSSPP. The Hidden Secret Menu

Let the credits roll until you return to the main menu. You will be awarded 5 tokens.

• Where to enter: Character select screen.
• Code: Move cursor to Marco. Hold L + R and press Down, Down, Down, Down, Up, Up, Up, Up, Left, Right. Release.
• Result: Leona appears. She has a unique slash attack instead of a knife.

Jupiter Item Trick (Metal Slug 3): In Mission 4, at the secret Rebel Army factory, reach the boss with the LV Armor mecha. Throw exactly two bombs at the boss's head and wait for the rocket animation; the first rocket will always contain a box of bombs.

: Complete all 7 games on Normal with limited continues to unlock Desktops 1 Hard Difficulty

3. Select Starting Level (Metal Slug 1 & 2)

• Code at character select screen:
  Hold Start + ↑, ↑, ↓, ↓, ←, →, ←, →, ×, ○
• Then: Use D-Pad to pick level 1–5.