If it says a computer game is free is it really free

There are some games for free and other only somewhat free. You should check for this type of things.

The game can be partially free like an trial version, demo, shareware or other stuff like that.

A game can also be free for an limited amount of time or be free only in some countries. (Like Far Cry or Prince of Persia in US because of ingame ad's)

Otherwise it's legal and free ! Have fun !