How do you play retro games?

Osmos (Linux)

Everyone
ESRB Rating
Genre
Perspective
Theme
...
MobyRank
100 point score based on reviews from various critics.
...
MobyScore
5 point score based on user ratings.

Linux

ESRB Rating : Everyone Everyone
TIGRS Rating : unknown
PEGI Rating : unknown
VET/SFB Rating : unknown
CERO Rating : unknown
USK Rating : unknown
OFLC (Australia) Rating : unknown
OFLC (New Zealand) Rating : unknown
RSAC Rating : unknown
ELSPA Rating : unknown
Kijkwijzer Rating : unknown