There are two ways to work in front of an EQ. One is moving things until it sounds better, which works sometimes and teaches nothing. The other is hearing the problem, knowing which zone it's in, and going straight there. The difference isn't talent: it's having a map of the spectrum internalised enough that «where is that?» has an answer before you touch anything.
Frequency Drop trains that map by association rather than memorisation: it hands you an instrument and you drop it into its band. There are 7 zones and 15 instruments, from kick to shaker, and the point is that after a few rounds you stop thinking in numbers and start thinking in places.
Almost no instrument lives in a single place, and the game reflects that: every card has one perfect zone and several acceptable ones. A snare has its body around 200 Hz and its crack between 1 and 3 kHz. Hitting the perfect zone scores more, but a reasonable answer doesn't sink you — because in a real mix it wouldn't either.
The full map, band by band with each zone playable, is in the frequency ranges guide. Once it's clear, the next exercise is hunting the exact frequency by ear in EQ Surgeon.