A challenge should be plausible, not impossible. It should be difficult to achieve, but yet easy to conceive. You should logically be able to visualise how it can be done – and this is a challenge that caused many Final Fantasy players nightmares in the past. 12 hours to get to the end of the game – How hard can that be? Very, when cutscenes were a part of the issue, but Steam helps us achieve this previously nearly impossible task.