The classic multiplayer roguelike, Risk of Rain, returns using an excess dimension and more challenging action.

Play solo, or team up with around three friends to fight your way through hordes of monsters, unlock fresh loot, and find a means to escape Earth.

How to unlock the hidden chamber in the Abandoned Aqueduct

The title says it all.

The how

There are two hidden buttons placed across the Abandoned Aqueducts.

Button 1:

Button 2:

Then the entrance looks like this.

For the buttons, you need to have both of them pushed at once.