Btw, you can add secret missions by adding something like "secret1.rl2,X" or "secret1.rl2,regular3.rl2". This makes it simpler to link secret levels to the regular levels you can access them from, since you can use the regular level's filename instead of having to count through your level list and use the right number. You also do not need to add the extensions there, so "secret1,regular3" would be just as valid (given there is a level "secret1.rl2" and a level "regular3.rl2" in your mission).
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Btw, you can add secret missions by adding something like "secret1.rl2,X" or "secret1.rl2,regular3.rl2". This makes it simpler to link secret levels to the regular levels you can access them from, since you can use the regular level's filename instead of having to count through your level list and use the right number. You also do not need to add the extensions there, so "secret1,regular3" would be just as valid (given there is a level "secret1.rl2" and a level "regular3.rl2" in your mission).