Creating a physics sandbox seems to be one way to get video game riches. Garry's Mod, a popular "game" available on Steam, hit the one million sales mark over the weekend. Garry Newman, creator of the mod, described the accomplishment as "more than I could have ever expected or wished for!"

The milestone will be celebrated with a new update, Newman promises.

"I know this isnât exactly Minecraft's 2.9 million," Newman says in the announcement post. Like Garry's Mod, Minecraft is a physics sandbox that has seen tremendous success while still in beta. "But this is a pretty big deal for me considering this all started off as a tiny tiny modification about 6 years ago."

Newman apparently was unprepared for million sales milestone, saying "I did plan to release a big secret update Iâve been working on when we hit 1mil. But itâs not ready â" you guys beat me to it." Unfortunately, he did not elaborate on what that update will entail.

Garry's Mod is currently available for $9.99 on Steam.