Ear training apps are great for that. I know that I used Complete Ear Trainer but it had only first 2 chapters or something like that for free but It had a great interval,note and chord recognition game. You can check that out. Other games for phone that come to mind are Tap Tap, Piano Tiles and ofc HTTK: Deathbat
. But they are games if you just wanna have fun. Rocksmith 2014 (PC, PS, XBOX) on the other hand is a great game that can help you with guitar playing. I’ve been playing it for 3 years and it helped me so much. I really recommend it.