Create save states for either v1.0 or v1.2. Saving is done by pressing Down and Start, or Select and A. Loading is done by pressing Up and Start, or Select and B.
This tool is available thanks to Matt Currie's gb-save-states
Provide a ROM of Super Mario Land 2: 6 Golden Coins. Both v1.0 and v1.2 ROMs are accepted. Once a valid ROM is uploaded, you will be able to apply the save states.