Tip: Avoid "item babysitting". Do not force the player to drag P-Switches or springboards all around the level. This is not fun, nor does it make for interesting "puzzles".
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Important note: Since October 7th, 2018 the patches section has been ongoing a full fledged remoderation to convert patches to Asar and SA-1, as well as to do UberASM conversions of certain patches and some other quality control - further details here. If a patch you were searching for was removed, please check this thread to get a(n unconverted) backup.