Their support of the mod community
Thinking back to Brentalfloss now: MEGAMEGAMEGAMEGAMAAAN!!!
where can i play this???
holy crap that Megaman Mod looks awesome!!
Yes, In fact they have make open source their old engines. Eg: Half Life 1 is a heavy modified version of the quake 1 engine.
Mega Man 8-Bit Deathmatch. W00t.
oh god yes!