For reconstructions.
There must be lots of cool tricks for pop/bang/fizz/pizzazz/whoosh. the kind of stuff someone would add to a reconstruction playback to turn it into a YouTube video.
Particle systems to sparkle certain stickers whenever a cross/F2L pair/center/whatever stage is completed.
Dramatic pacing
Classy/flashy display of the current stage
Highlight active pieces.
"Iron Man"-style heads-up display of statistics, like move counts for the current stage/whole solve.
View multiple solves from an average/competition.
Watch animated reconstructions in tandem with videos.
Possibly allow matching perspective?
For competition solves, flash the geolocation of competition at some point?
For reconstructions. There must be lots of cool tricks for pop/bang/fizz/pizzazz/whoosh. the kind of stuff someone would add to a reconstruction playback to turn it into a YouTube video.