Thought Bulletstorm was heavy on the expletives? Developer People Can Fly thought so, too.

Creative director Adrian Chmielarz told Game Developer magazine the team was surprised by the reaction to the swearing in the over-the-top, Epic-produced FPS - but admitted it went too far.

"Do you know any swear word in a foreign language?" he asked. "German, French, Polish? When you say it out loud, no biggie, right? Not a problem to use it during a family dinner, I assume?

"That is how all the f-bombs sounded to us. Being Polish, all the strong language in Bulletstorm was just exotic and fun to us. We did not feel its power. In other words, Epic thought this is what we wanted and respected our creative vision, while we had no idea this vision was a bit more than we really wanted.

"It was only at the end of the development, when I read the Polish translation of the game, that I realized how dirty we were. I swear a lot. A LOT. And yet still I… kind of blushed."

Bulletstorm launched early this year to critical acclaim, but it struggled to set tills ringing.

In Eurogamer's 9/10 Bulletstorm review, Christian Donlan said "this is a game that wants you to laugh so hard that you sneeze on yourself, but it's also a game that wants you to experiment as much as possible with the tools you've been given".

"Its cleverness is as lightly worn as it is unexpected. It's the best kind of guilty pleasure. "