Most of my friends got bored of Halo a while ago, so is there any fun single player mini game maps? Like puzzle maps but not puzzle maps? haha
Puzzle and jumping maps are really the only ones that can work for a single player. If you want to play customs find some friends on Forge Hub or join the testers guild.
I deleted all the ones I downloaded to make room for competitive maps and I forgot their names. Try using the search bar and most are made by the same few people so they are linked in their signatures.
Limitations by Xang Jumping Flower by Xang Mountain Climb by Xang Yeah, Xang specializes in jumping maps . Also the Flaming Ninja maps by petetheduck are good too. You can find them here.