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“Hex Tweaks” are loosely defined as sets of single-or-multiple-byte-changes that can be preformed for desirable effects. There is no clearly-defined upper limit for the number of bytes that can constitute a 'hex tweak' but they are usually less than 16 bytes' worth of changes.
Tweaks for beams, missiles, and bombs.
0x53FC - 60 to ??
Changes the amount of time it takes for a bomb to explode. Change this to 30 for Super Metroid's bomb explode time, or 20 for Zero Mission's.
Tweaks for energy and missile drops.
0x8270 - 05 to ??
Changes the amount of energy an energy drop will add.
0x82AC - 05 to ??
Changes the amount of missiles a missile drop will add.
0xAA43 - 05 to ??
Changes the amount of missiles it takes to open a hatch.