Hello! One of the achievements is Lucky Ghost, whete you need to pick up an invisible boost on the track. Does anyone know where these are or is it random chance?

Thanks in advance!

There's one hidden on every track, and they're in specific spots

I don't know the spots though

Sorry, thought I remember seeing a question like this, and sorry for latency

There's a consistent number of invisible boost gems for each level with consistent positions, i.e. a hidden boost on the warning sign at the beginning of Quake Canyon, or on the divider past the tunnel that comes before the merry-go-round area in Hong Kong Buoy

I haven't payed attention or been on the look out for other hidden boosts, but there's two other hidden boosts I distinctly remember getting just by going certain directions while grinding for times