Kof Theory Mercenary Screenpack 400 Slots Down... May 2026

Open select.def.
You’ll see something like:

[Fight]
; blank lines allowed
kfm/kfm.def
; etc.

Let’s solve the "down" problem. You don't need to abandon the 400 slots; you just need to modernize them.

Screenpacks often split slots into:

Check if your screenpack uses:

For MUGEN enthusiasts who grew up in the era of WinMUGEN and early 1.0, the KOF Theory Mercenary screenpack holds a legendary status. Known for its gritty, "story-mode" aesthetic and intense King of Fighters vibe, it remains a favorite for creators building massive rosters. KOF Theory Mercenary Screenpack 400 Slots Down...

If you are looking for the 400-slot expansion and finding dead links, here is a guide on the screenpack, its features, and where to look.

If you have an old version that only shows 200 slots, you need to edit the system.def file. Open select

Open data/system.def (or data/mugen1/system.def). Find the [Select Info] section. Change these values:

rows = 20
columns = 20

Yes, 20x20 equals 400. However, the default MUGEN font spacing might overlap. You must also adjust: Let’s solve the "down" problem

spacing = 16,8 ; (Adjust X and Y so portraits don't touch)

Originally based on The King of Fighters universe, the "Mercenary" screenpack distinguishes itself from the standard KOF packs in a few key ways: