For DeathRun, we use "emulator" in slightly different terms than what it actually means. The emulator box should be checked if you submit a run played from a mobile (phone, tablet, etc.) device but uses a PS4 or Xbox controller to play. So basically we say "you're playing on mobile but emulated using a controller".

If this doesn't apply to you, don't worry about checking the box. :) If you DO play this way, please submit the runs to the PC/Console category, NOT mobile, as it's unfair to users who actually play with mobile controls.