This is a video of me, Tasselfoot, beating the last 15 levels of Blosics 2 Level Pack. All levels show both completion and challenge completion in 1 run. You may have issues on level 25, 27, or 30... those all use the "freeze" option (F-key), which you get at 20 challenges completed.

Game: http://notdoppler.com/blosics2levelpack.php