A simple premise: using a time machine creates a clone of yourself that exists up until the point at which you went back in time.
Iteration is an experiment with a quirky form of time travel. Paradoxes are possible, but will come undone if you revisit the time at which they were created. Sometimes to save yourself, you must kill yourself; sometimes to fix time, you must break it. Use with caution.
There are 5 training levels, and 6 proper puzzle levels.