Is there a way to hide a Steam game from your recently played list?

A friend of mine said he's seen me playing a game (Batman: Arkham Origins) on Steam while I was at work. Since he only has two friends in his list I tend to believe him (ruling out a mix-up)
But the game does not show up on my recently played list. Is there a way to play a game without appearing in that list or to delete an entry?
Just to be sure, I changed my Steam password.
Best Answer
If you disconnect from the internet while playing the game, it won't count towards your hours played.
If you think someone else might have been on your account, Steam logs where people access your account from via IP address. So if you log into your account from a new computer, it will require email verification before you can login.
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Steam: How to hide recent game activity \u0026 game hours
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