Tip: Switch palace switches normally disappear if you replay the level. However, if you insert them as direct Map16 and use the hex-edit at $00EEB2 in the ROM map, you can replay the level without a problem.
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Details for Tessera, v. 0.52 (imamelia's Sprite Tool)
This is a tool that allows you to insert custom sprites into a SMW ROM. It is written in Perl, works on multiple OSes, supports headerless ROMs...and has a LOT more functionality than mikeyk's or Romi's Sprite Tool. It can insert many more sprites than either of them, as well as more types of sprites, and it allows for more customizability within a single sprite without using separate .cfg files. It also includes quite a few sprites ready to use.