The Cog Gallery is a gallery that keeps track of how many cogs you've encountered and destroyed. The cog gallery begins at bronze rank until you beat enough types of certain cogs, you'll be upgraded to silver rank and unlock the cog radar. A cog radar is when you click on the cog symbol and it shows how many of each specific cog are within the radar's range. Then when you fight another certain amount of each cog you'll be upgraded to Gold rank and unlock the building radar! The building radar works in which you click the cog's symbol and it tells how many of that type of buildings' are in the radars range. This can really help with tasks that require you to beat specific cogs or buildings!