This may kill your productivity stone dead.
If you’re a fan of Lost or Doctor Who, then you might like Chronotron. In this cute puzzler you play as a robot whose time-travelling machine (which looks suspiciously like the TARDIS) is broken. It’s only able to loop back in time and to fix it you need to collect the circuits in each level to fix it.
Here’s the nifty bit – you can use your time machine to create multiple (past) versions of yourself to help you solve the puzzles. You can create as many copies as you want, but if you interfere with a past self’s ability to return to the time machine, you will cause a game-ending paradox. Some lateral thinking is needed here to clear the 35 levels and 5 bonus levels.
Play Chronotron at Kongregate.