Patches

How do patches work, at least how can I use them to update my games?

Normally you overwrite old files with patched ones.

There aren't that many bytelevel patchers that only replace / extend where needed, especially nearly no free ones.

There's one decent patch maker that's free if you allow it display the manufacturer's ad screen during patching:
http://www.downlinx.com/proghtml/155/15588.htm
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Gerry Quinn
http://bindweed.com
No Blitz games yet, but one in gestation!

MoleBox Pro can also do patches:

http://www.molebox.com/manual-patches.shtml