From Sonic Retro

Segaretro-round.svg This template has been manually copied from Sega Retro, specifically Template:ScreenThumb
Technical restrictions prevent this template from being shared across multiple wikis. In the medium term, any changes should be made to the Sega Retro variant first, before manually copying the contents back here. As this is not an automatic process, this version of the template might also be out of date.
SonicTripleTrouble GG EggmanOpening.png
Right aspect ratio
Wrong aspect ratio

Bobscreen thumbnails, so the aspect ratio is corrected.

{{ScreenThumb|SonicTripleTrouble GG EggmanOpening.png|Right aspect ratio}}

Not quite as smart as the standard Mediawiki one for File, so you might need to use other arguments to make sure screenshots don't dominate:

| width=
| height=
| forcewidescreen=