From The Cutting Room Floor

Metroid II: Return of Samus
Developer: Nintendo R&D1 Publisher: Nintendo Platform: Game Boy Released in JP: January 21, 1992 Released in US: November 1991 Released in EU: May 21, 1992 This game has debugging material.

Metroid II is best known as "that game between the first one and Super Metroid".

Debug Mode

The Game Shark code 0101A0D0 will enable some debug features. They are all accessed from the pause screen.

Here you can adjust what items you have. Select a bit with Left / Right and press A to toggle it.

• Bit 0: Bombs
• Bit 1: High Jump Boots
• Bit 2: Screw Attack
• Bit 3: Space Jump
• Bit 4: Spring Ball
• Bit 5: Spider Ball
• Bit 6: Varia Suit
• Bit 7: (Unused)

You can also change what weapon you're using by pressing up/down.

• 00: Standard
• 01: Ice Beam
• 02: Wave Beam
• 03: Spazer Beam
• 04: Plasma Beam
• 08: Missiles

With debug mode enabled, you can save anywhere! From the pause screen, press Select. As long as you're not in the air, your game will be saved. This causes the save text to be loaded over the enemy graphics when you start again, which can be fixed by moving to another area.

The Metroid series
NES	Metroid
Super NES	Super Metroid
GameCube	Metroid Prime (Prototype) • Metroid Prime 2: Echoes
Wii	Metroid Prime 3: Corruption (Prototype) • Metroid: Other M
Game Boy	Metroid II: Return of Samus
Game Boy Advance	Metroid Fusion • Metroid Zero Mission
Nintendo DS	Metroid Prime Hunters ("First Hunt" Prototype)