This is an example of having a heck of a lot of time. This guy designs a level for Super Mario World which requires absolutely 0 input by the user. Full of bouncing off power-ups, riding on animals, and using the physics engine gravity to propel Mario. When I saw this, I was absolutely floored by how much pain staking details went into this level design. It even has a boss battle at the end, again with 0 input by the user. Check it out: