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Message: <blockquote data-quote="Voadam" data-source="post: 8040791" data-attributes="member: 2209">The main differences were stats and classes so the player end. The DM material like modules and monsters were easily swappable.B/X BECMI line had a range of stat modifiers that ran up to +3 bonuses and started at lower stats, while AD&D had a reverse bell curve of bonuses where a 14 might get you nothing but had the extremes of percentile strength giving significant damage modifiers from first level on.AD&D after <a href="https://www.drivethrurpg.com/product/170096/Unearthed-Arcana-1e?affiliate_id=17596" target="_blank">Unearthed Arcana</a> also had weapon specialization giving more attack bonuses, damage, and attacks from first level, plus AD&D had some weird optional rules on two weapon fighting. AD&D also had a cool martial arts system from <a href="https://www.drivethrurpg.com/product/17334/Oriental-Adventures-1e?affiliate_id=17596" target="_blank">Oriental Adventures</a>.Basic starting with the <a href="https://www.drivethrurpg.com/product/17167/DD-Master-Set-BECMI-ed-Basic?affiliate_id=17596" target="_blank">Master Set</a> in BECMI had weapon mastery.Attack bonuses increased more for AD&D classes over levels.Clerics in Basic only got spells starting at second level and did not get bonus spells for wisdom. AD&D ones had them from first level and got bonus ones for wisdom which represented a significant increase in magical healing at low levels.Basic magic missiles, fireballs, and lightning bolts were not capped for damage so that was an increase over 2e D&D.HD increased from OD&D to Basic to AD&D. In OD&D it was d6s mixed with some levels of +1 hp, in Basic it was from d4 to d8, in AD&D it was d4 to d12, with a bunch getting a die higher than in basic so an average of +1 per level increase. More characters got bonus hp from the Basic stats, though fighters could get more bonus ones on the reverse bell curve of AD&D.On the monster end most stats were the same across editions. Dragons and giants got a significant HD boost going from 1e to 2e though and skeletons and zombies doubled in HD from OD&D's 1/2 and 1 HD to Basic and later editions' 1 and 2 HD. Shadows are not undead in Basic but are in AD&D. Magic resistance and psionics were something added in for AD&D. Basic monsters had a morale with some suggested rules for determining if they ran away or surrendered.Initiative was different from Basic to 1e to 2e but were easily swappable.I used B/X modules, monsters, and magic items in AD&D games without pause. I used the Moldvay Basic explanations of a lot of rules in AD&D regularly.I played in an AD&D game that incorporated BECMI's weapon mastery.</blockquote>

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