Multiplayer platform games for PC/Windows with 2-player online support

ibb & obb

2 local, 2 online

Awesomenauts

3 local, 3 online

Bloody Trapland

4 local, 4 online

Muffin Knight

0 local, 2 online

Spelunky

4 local, 4 online

Biped

2 local, 2 online

Bloodstained: Ritual of the Night

2 local, 2 online

Sonic the Hedgehog 4: Episode II

2 local, 2 online

Outland

0 local, 2 online

Bob Was Hungry

0 local, 8 online

Spelunky 2

4 local, 4 online

To The Top

0 local, 8 online

Ms. Splosion Man

4 local, 4 online

Skeleton Crew

4 local, 4 online

Bloody Trapland 2: Curiosity

4 local, 4 online

Caveblazers Together

0 local, 4 online

Thief Girls Quartet

4 local, 4 online

Tallowmere 2: Curse of the Kittens

4 local, 4 online

Vagante

4 local, 4 online

Jack Axe

4 local, 4 online

TeamJumpers

2 local, 2 online

DDraceNetwork

0 local, 64 online