Hm, but that clock likely seeds the PRNG used to create the gameplay. If that was always the same then the whole exercise would be pretty boring. So their expe

Hm, but that clock likely seeds the PRNG used to create the gameplay. If that was always the same then the whole exercise would be pretty boring. So their experiments purposely vary the time. It's just that for some input value, the thing they are running dramatically (well...) differs from other times, and the model wasn't expecting that, nor were the authors.