Neo Coliseums are a variation of on regular Coliseum, just like Neo Clashes are variations on Clashes. What's different?
Neo Coliseums last 5 days and do not repeat often (so far, at all). Just like Neo Clashes, they are accompanied by Chopperman Missions, usually rewarding you for completing each variant 15 times.
They introduce a character that appeared in a prior Coliseum but in a different type.
They are class-restricted, just like Neo Clashes, to 3 different types. The 30 stamina easy version is pretty much identical to the regular, old coliseum. The new 50 stamina type-restricted ones are different, just like Neo Clashes.
There is also a 0-stamina version, usually featuring all 4 mini-bosses. It is pretty hard, can be cleared only 3-times, but offers good rewards (and also drops an evolved version of the Neo Coliseum character, so if you can clear a 0-stamina one, you don't need to evolve him).
Neo Coliseums to date:
- early May'18: Neo Coliseum vs Kin'emon
- late May'18: Neo Coliseum Vs. Killer
- July'18: Neo Coliseum Vs. Drake
- August'18: Neo Coliseum Vs. Diamante