TNT is an extra tracks mod of the Amiga version released a few years ago by AmiGer. Here’s his announcement post:
Stunt Car Racer TNT (The New Tracks) will be released around christmas.
Eight new tracks:
DIZZY DESCENT, WITTY WAY, CRAZY CAPER, AMAZING ADEPT, JERKILY JUMP, EVILLY EPISODE, TEASING TEMPER and RAT RACE
Track parameters changed:
start positions, start height, damage sensitivity, boost count
AI speed adjusted/changed for all tracks
Some visual adjustments
e.g. race colours, track names gfx dropped, title screen modified etc.
Long time readers will know my dislike for Blur and I’ve hardly played NFS Hot Pursuit since I got it last month but Stunt Car Racer gripped me like no other racer since. It required perfectly timed boosts, cornering and was literally a rollercoaster of a ride.