Off The Rails

Off The Rails
Map	U-Turn
Waves	10
Starting Cash	$900 $1,000 (Group Bonus)
Health Scaling	20% (Duo) 40% (Trio) 60% (Quad)
Suggested Towers	Soldier
Triumph Rewards	180 & 30 EXP (First Time Triumph) 60 & 30 EXP (Repeat Triumphs)
Timeline
Chapter	TDS: Origins
Previous Mission	Radio Silence
Previous Mission	Radio Silence
Next Mission	Burning Bridges
Next Mission	Burning Bridges
Star Requirements
3 Star Health	75% or higher
3 Star Time	360s or lower
2 Star Health	50% or higher
2 Star Time	450s or lower

Description

Off The Rails is the third mission for the first chapter of the Story mode.

This mission has health scaling, meaning that in duos, enemy health is increased by around 20%, in trio 40% and in quad 60%.

Rewards

Off The Rails has a 180 and 30 EXP reward upon first triumph. Any subsequent triumphs will reward 60 and 30 EXP instead. Losing on any wave will only reward 0 EXP.

Additionally, the mode can also give out a bonus triumph reward. The possible rewards are:

• Common
  • Grenade
  • Flash Bang
  • Molotov
• Uncommon
  • Time Scale Ticket
  • Revive Ticket
• Rare
  • Low Grade Crate
  • Spin Ticket
  • Barricade
  • Supply Drop
  • AirStrike

Enemies

Speedy Wave 1 78 Total	Normal Wave 1 108 Total	Slow Wave 2 94 Total	Normal Boss Wave 4 23 Total
Armored Wave 6 26 Total	Necromancer Wave 8 3 Total	Skeleton N/A N/A Total	Slow Boss Wave 10 1 Total

Wave Structure

The wave bonus in this mission is:

$500 + (Waves Completed - 1) × $400

The wave clear bonus appears when every enemy from that wave was killed. It is 35% of the wave bonus in solo, while for duo, trio and quad it is 20%.

Depending on player count, the wave bonus is reduced using multipliers. These multipliers are:

Players	Reduction per Player	Total Reduction
Solo	0%	0%
Duo	5%	10%
Trio	5%	15%
Quad	5%	20%

The waves in Off The Rails follow these timings:

Waves	Wave Timer	Skip Time
1-8	1:00	0:20
9	1:30	0:30
10	∞	N/A

Bolded names indicate an enemy's debut.

Wave	Dialogue		Enemy Type & Amount
1	Commander	I'm seeing movement inside of the building. Recruit set up—… wait. Is that Demo?	4x Speedy, 12x Normal, 4x Speedy, 12x Normal
	Soldier	Oh-ho! No way, AND Hops? I had a feeling it'd be one of you but not both!
2	Hops	Well look what the dog dragged in. Haha! It's good to see you, buddy. It's also nice to see familiar faces after being ditched.	4x Slow, 8x Normal, 4x Slow, 8x Normal
	Demoman	We heard the distress call and had to do something. The leader of these guys ended up with a nasty bite and turned before injuring a few others. They locked him in the freezer for now.
3	Commander	You disobeyed direct orders. Not sure I'd call it 'Ditched'. Though, I'm glad you're both alright. We need to figure a way out of here, otherwise we'll be drowning in zombies.	6x Speedy, 15x Normal (Bloated), 6x Slow, 16x Normal (Bloated)
	Demoman	The train to Cyber City isn't that far from here and we can walk the tracks. We just didn't have the manpower to bring anyone wounded that far. With your help though, we'll have a chance.
4	Sniper	Hm. If we take the railway the APC won't be able to follow us. Not to mention not being able to carry everyone. Maybe it can take the most injured while we bring everyone else through the tracks.	10x Slow, 5x Speedy (Nimble), 1x Normal Boss, 10x Slow, 5x Speedy (Nimble), 1x Normal Boss
	Commander	Good plan. It'll keep us from getting swarmed too. The zombies have already caught up to us, so help me get the survivors ready to move. Anyone who can't goes into the APC.
5	-		8x Normal (Bloated, Nimble), 14x Speedy (Bloated, Nimble), 7x Slow (Bloated, Nimble), 8x Normal (Bloated, Nimble), 14x Speedy (Bloated, Nimble), 7x Slow (Bloated, Nimble)
6	Soldier	Watching these things run reminds me of how Hops got his name. Come on, Hops. Tell em' — Tell em' about the time in basic you pranked the NCO and —	1x Normal Boss (Bloated), 3x Armored, 8x Slow (Nimble), 1x Normal Boss (Bloated), 6x Normal (Bloated, Nimble), 3x Armored
	Hops	You mean the time YOU pranked the NCO and I took the fall for it.
7	Soldier	Haha! — Oh man… He couldn't even run. They tied his legs together and made him jump like a rabbit while the rest of us hunted him down.	16x Normal (Bloated, Nimble), 6x Speedy (Bloated), 5x Normal Boss (Bloated), 1x Armored (Bloated), 8x Speedy (Bloated)
	Soldier	That was training for — what — a week straight? Man that was good. You even got a nickname out of it.
	Hops	We're enemies. Mortal enemies.
8	Commander	The APC is loaded. We're waiting for the rest to gather their things. Glad you two found your bromance when we're about to be eaten.	2x Normal Boss, 2x Armored, 1x Necromancer, 1x Normal Boss, 2x Armored (Nimble)
9	-		1x Necromancer, 4x Normal Boss (Bloated, Nimble), 12x Slow (Nimble), 1x Necromancer, 12x Speedy (Bloated, Nimble), 6x Armored (Nimble)
10	Sniper	There's a break in the horde after this group. Should we take it?	3x Normal Boss (Nimble), 1x Normal Boss (Bloated, Nimble), 6x Slow (Bloated), 4x Armored (Bloated), 3x Normal Boss (Bloated, Nimble), 10x Slow (Bloated, Nimble), 1x Slow Boss (Bloated, Boss), 5x Armored (Bloated), 10x Slow (Bloated, Nimble)
	Commander	Everyone, on me! We're going to the tracks!
Lose Dialogue
		One icon and dialogue is randomly chosen upon defeat: •We're toast! •OOF! •Mission Failed, we'll get em' next time. •Not enough numbers! •Mistakes are just part of the journey.. •We're overrun chief! •We'll get them next time! •Don't give up! •We need back up sergeant! •We just had our grave dug.. •We have to fall back soldier! •Oops! Try again! •The enemies got to the base! •Strategy is key!

Soundtracks

Wave 1-4

• 
  (Official) Tower Defense Simulator OST - Synthesia

Wave 5-9

• 
  (Official) Tower Defense Simulator OST - Oasis Plague

Wave 10

• 
  (Official) Tower Defense Simulator OST - Funky Zombie

Update History

• 31 July 2026 - v2.4.0
  • Off The Rails added.
• 7 August 2026 - v2.5.0
  • Health scaling added.
    • 20% in duo.
    • 40% in trio.
    • 60% in quad.

Notes