I’ve said it before, and now I’m saying it again: Into the Odd beats almost any other OSR game (with @Olde House Rules games being the exception) in efficiency, quickness and pure joy of playing.
Another OSR game system that I consider to be among the best out there is The GLOG and its hacks (Arnold K.’s “Goblin Laws of Gaming”, original game is here: https://goblinpunch.blogspot.com/2016/05/the-glog.html) because it makes writing new classes, flexible spells and multiclassing a snap. Currently, there are more than 300 classes and more than 500 spells available, all for free. Similar to Into the Odd, you can play any old school D&D module and convert it to Glog on the fly.
Now, Moonhop combines the super-quick gameplay, character generation and decisive combat of Into the Odd with the Glog’s class and magic system. This, gentlemen, is truly magnificent. Buy it here and play, play, play: https://www.drivethrurpg.com/product/271188/Moonhop
Darkworm Colt 