I mostly play at $1.25 9 man sitn gos on full tilt.
This is my strategy:

Early i play extreamly tight, however i play a little passive, i limp with my small pockets in late position and possibly with a suited connector. Once the blinds reach 30/60 i become more aggressive stelling a lot when i am in position and c betting. once it gets to 4 people i become extreamily aggressive. If i am low on chips i push with any ace and a lot of other some what weak hands, but i only do this against passive players or people who are just trying to get in the money. Later, when its down to 3 people i get a little tighter and wait for it to get down to 2 people.

I’ll be interested to see the comments from better sngo players because this is remarkably similar to how I play them. fwiw I’m a marginally profitable sng player at microstakes using this strategy.

...oh, and get to the 2.25 as soon as possible