aramis erak
Legend
T&T changed none of the processes save paying for/casting spells. 1st ed combat works just like 4th, 5th, 5½th 7th, 7½th, and DT&T. (2nd & 3rd are literally just edits of 1E, per Ken St. Andre. There is no 6th; Ken's instructions are any homebrewed variation is 6th)For an unmentioned example, Tunnels and Trolls 5th and 7th edition both altered the system significantly. Many fans disliked the changes, since they'd made older material incompatible both times.
If using a module for early eds (1-4), add a die to all weapons.
if using 1-5, spells pay with Str; 5½ and later pay with Wizadry/Kremm. So when using 5E stuff, for detailed casters, make Wiz equal the original STR, and regenerate STR.
Early editions have no Spite Damage; 5.5 and later do. (Any attack die showing a 6 does direct damage like how TTYF works.)
Technically, 7.x requires your current Wiz to exceed the target's to successfully cast; most of us ignore that.
All editions are more cross compatible than AD&D1E to AD&D2E...
The "edition warring" within T&T is way more subdued than most, as most stuff can be pulled either way seamlessly.