serious sam 2 will have single and 16 player co-op right out
of the box and deathmatch mode later with a patch croteam will
release shortly after

for me this is just fine cause you usually start playing a
game in single mode and only after completing do you want to
try multiplayer so by the time we have finished single player
we will have a patch to apply and give us deathmatch

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post made in a steam-free computer
i said "NO" to valve and steam