Released in arcades in 1996, Prop Cycle utilizes an innovative control scheme designed to trick unsuspecting gamers into exercising by having them pedal a special bicycle controller to propel the titular prop cycle forward.
Debug Displays#
Three disabled debug displays can be re-enabled by adding the following code to propcycl.xml:
<cheat desc="Enable Debug Dipswitch">
<script state="run">
<action>maincpu.mw@22296=4E75</action>
</script>
</cheat>
Enable the code then turn on dipswitch 5 (listed as Unknown in MAME) and some debug info will now be displayed during certain parts of the game.

Replay debug display.
Tutorial debug display.

Level debug display. Also displays the current speed of the blower fan.
(Source: MAME source code)