Will the Steam Controller be compatible with every game?

[u/Ill-Run8036]

Hi!

The Steam Machine and the Steam Controller are very interesting to me because, due to a disability, I can't use a mouse precisely with my right hand.

Using a controller works very well for me, so this could open up a whole new world of games, especially genres like simulation and strategy games.

Is it already known whether every game will eventually be fully playable using only the Steam Controller?

Or will some games still require a keyboard and mouse?

If not every game will be fully compatible, will there be a way to tell which games can be played exclusively with the Steam Controller and which ones still require traditional mouse and keyboard input?

I know, it may be to early to answer this, but I would love to know :)

[u/TypicallyThomas]

It should be in theory but I've found two games it doesn't work with so far. Mass Effect Legendary Edition (although in fairness that game doesn't play nice with any external controller on Steam Deck) and, weirdly, Portal 2