$1ED2 is in the middle of the overworld level setting flags
. These flags may vary from hack to hack, and not all hacks will affect all the addresses there ($1ED2 in particular corresponds to level 10C, which is unused even in the original game). However, it is a good way of checking whether particular levels have been beaten, as long as you check the correct corresponding address.
If you have the option to check combinations of RAM addresses for conditions, the most accurate solution for file startup would be to check $0100
for value 0A (on player select menu) and then $16 and $18
for either having a value of 0x80+ (A/B pressed).
Professional frame-by-frame time wizard. YouTube
- SMW Glitch List
- SMW Randomizer