Sonic The Hedgehog 2

Not as hard as it sounds providing that you stay as high as you can. Try not to get distracted by rings and items, only destroy enemies that need destroying and try and learn where to jump and use the surroundings to boost you upwards and forwards.

A couple of test runs might be sufficient to try to see which ways take the less time to get past. if you fail, simply restart and try again. Using the spin dash is a good way to gain speed and fast but don't always rely on it to work as well as you'd hoped!

The video might help...

Upon beating EHZ 1, do so under 35S playing single player or coop mode. Better chances at single player.

Simply follow the steps in the video below:
Tips from the video:
- Try to go around obstacles
- Avoid enemies
- Aim for speed power-ups