Create a practice ROM with save states for either v1.0 or v1.2.
After the title screen, a menu is available where you can pick a level and power-up. The ROM remembers your last choice through a soft reset. If you are using a v1.0 ROM, you can press select to have the pipe glitch active.
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 and lightbulbsun's work in creating the practice menu, v1.0 save states, and IPS patches.
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 patches.