It would be useful to show the interval names (minor 2nd, perfect 5th, octave, etc) in addition to the number of semitones.

In the note distance game, when the current level of the pyramid includes 21 trials, there are 10 different intervals to choose from.

Sometimes, however, an extreme compound interval is played between one of the lowest notes and highest notes in the playable range.
I'm not sure if this is the case every time, but I've noticed several times that not a single one of the 10 selectable intervals is accepted as an answer, so you are forced to keep getting it wrong until you slip back to the previous level of the pyramid (this could be 21 times in a row).

Also, when very low notes are played, it seems to be too low for the sample used, because it's very difficult to distinguish the correct interval and I have to click by trial and error. The result usually sounds wrong.

Hello,
Love your work friend. A few suggestions,

1. The pitches you use seem to be slightly flat by a few cents, I'm trying to work on my 'perfect pitch' and love your 3 game system but I don't want to ingrain notes that are a little under.
   (ie the octaves on honky tonk piano sound)
2. In the 'Note name' game relabel the most common notes (i.e. A# to Bb & D# to Eb) or better yet, put both names in the box (i.e A#/Bb)
3. This last point I've been desperately searching for and it's to assign random sounds to the pitches, I.e. a piano is great but maybe a violin, voice (male/female), tuba, flute, clarinet, trumpet etc. It means in real life when we encounter instruments with different overtone balances we can know to listen to the true center note and not get confused.
   The hard thing with this is finding a) real sound files not just midi/synth versions & b) making sure all the examples you are sourcing are in exact tune (equal temperament to a piano)

I have other ideas for this but I don't want to flood with comments -

Lastly thank you so very much for building the program!! I greatly appreciate it.
I've used it for about an hour all up and plan to do 10 minutes a day. I'm already fluent on all the hardest lvls of this stuff (including bizarrely spaced intervals)
I conduct a few different choirs/orchestras. I'm just looking to get monstrously fast at it so it's useful on the fly.

Cheers mate,
Ben