Vacuum

It's just standard, and personally, I think it's a bit easy. There are too many weird things in other 25s.

As others have mentioned, this song is so textbook that it could be considered the standard for all 25s. It has a very appropriate amount of movement and gauge-draining off-beat, and requires quite a bit of technique—like the full staircase before the run and the 2+1 drills—but the difficulty distribution is so perfect that it's a must-play chart. The short runs with a bit of half-twist at the beginning are harder than they look, so the break on point is to avoid losing stamina there and anticipate the full staircase before the run.

A chart where you lose HP on the slow-speed alternating stairs.

The best chart to start with for 25. If you can maintain your gauge through the early run and the drill, it's a straightforward chart that's easy to break on.