Mode with keys, like a Mystery box 1, 3 and 5 or only 1 and 3.

Subway Surfers Key:

19s 497ms

Play the video on 14:44 you can see the cutscene:

https://www.speedrun.com/battletoads_and_double_dragon_snes/run/m7qon10z

Mode without using skates? Example:

%Survive without skates: (15min aprox)