Found this guide online for chapter select instead of replaying the entire campaign
How to chapter select
Where mapname is:
01 – Seppuku Station – $BULLET.MAP
02 – Zilla Construction – $DOZER.MAP
03 – Master Leep’s Temple – $SHRINE.MAP
04 – Dark Woods Of The Serpent – $WOODS.MAP
05 – Rising Son – $WHIRL.MAP
06 – Killing Fields – $TANK.MAP
07 – Hara-Kiri Harbor – $BOAT.MAP
08 – Zilla’s Villa – $GARDEN.MAP
09 – Monastery – $OUTPOST.MAP
10 – Raider Of The Lost Wang – $HIDTEMP.MAP
11 – Sumo Sky Palace – $PLAX1.MAP
12 – Bath House – $BATH.MAP
13 – Unfriendly Skies – $AIRPORT.MAP
14 – Crude Oil – $REFINER.MAP
15 – ♥♥♥♥♥♥ Mines – $NEWMINE.MAP
16 – Subpen 7 – $SUBBASE.MAP
17 – The Great Escape – $ROCK.MAP
18 – Floating Fortress – $YAMATO.MAP
19 – Water Torture – $SEABASE.MAP
20 – Stone Rain – $VOLCANO.MAP
21 – Shanghai Shipwreck – $SHORE.MAP
22 – Auto Maul – $AUTO.MAP
You can also use /s1-4 to set your skill level.
Example
Will load flying fortress on tiny grasshopper difficulty on starting the game
Thanks to PsychoticHouseCat for his excellent guide, all credit to his effort. if this guide helps you, please support and rate it via Steam Community. enjoy the game.