I just finished the Tower half an hour ago. Didn't skip any tests.
Hardest for me were:
#251 -- I spent over an hour last night, got so frustrated and my fingers really started to hurt. Went to bed, woke up today, and got it in 4-5 tries.
The final Test Your Might -- I swear my controller and fingers almost broke with that one.
#300 -- at first it was really hard, but I started getting used to the AI, and got past Goro/Kintaro mostly intact. Used Scorpion.
I had a blast, I love beating these things and get that feeling.
Lots of fun, I even sat with my head upside down for the reverse screen tests, made them real easy.