Rolemaster has a couple different versions but here's the short -
Combat is d100 exploding (where if you roll 95+, you keep rolling and adding)
One roll, add your bonus, subtract their defense bonus.
Cross index on the appropriate table for your weapon and their armor, find damage, and if you crit.
If you crit, d100 on another table.
Skills are d100 + skill - difficulty, 100+ succeeds.
You still have levels and classes, but the classes determine how expensive different skills are.
Not for everyone, some would say, not for anyone.