Welcome, S.T.U.N. Runner.
Test Track#
To access the test track, add the following to stunrun.xml and enable the cheat when the game is showing you the preview of the next track.
<cheat desc="Test Track">
<script state="on">
<action>mainpcb:maincpu.pb@FF9579=17</action>
</script>
</cheat>
The track is a very short, straight track only containing two tunnels and a finish line.
(Source: Ferrox)
Crash Handler#
If the game ever crashes, it'll display a crash handler.
(Source: Ferrox)