Surface Tension

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Description

Surface Tension is the seventh 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

Surface Tension has a 800 and 70 EXP reward upon first triumph. Any subsequent triumphs will reward TBA and 70 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

COPIED FROM ROCK BOTTOM AS PLACEHOLDER

Normal Wave 1 26 Total	Slow Wave 3 47 Total	Speedy Wave 3 10 Total	Normal Boss Wave 4 20 Total
Skeleton Wave 5 39+ Total	Necromancer Wave 6 7 Total	Hidden Wave 7 34 Total	Armored Wave 8 36 Total
Slow Boss Wave 9 3 Total	Giant Skeleton Wave 12 1 Total

Wave Structure

COPIED FROM ROCK BOTTOM AS PLACEHOLDER The wave bonus in this mission is:

$500 + (Waves Completed - 1) × $525

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 Burning Bridges follow these timings:

Waves	Wave Timer	Skip Time
1-11	1:00	0:20
12	∞	N/A

Bolded names indicate an enemy's debut.

Wave	Dialogue		Enemy Type & Amount
1	Soldier	Who would just leave random traps everywhere? Agh! Are they trying to collapse the cave? File:RockBottomWave1-1.ogg	11x Normal
	Commander	Maybe we should have left them alone. The horde is starting to follow us down here. Create a choke point and hold them back. We need a plan. File:RockBottomWave1-2.ogg
2	Commander	Dispatcher, do you read? Of course not. There has to be somewhere where we can— File:RockBottomWave2-1.ogg	10x Normal (Bloated)
	Trapper	Hey! Who do you think you are, setting off my mines like that ?!? You got rocks for brains or somethin'? File:RockBottomWave2-2.ogg
3	Sniper	Great. It's *this* guy. I didn't want to get out of here alive anyway. File:RockBottomWave3-1.ogg	1x Slow, 3x Speedy (Bloated), 1x Slow, 3x Speedy (Bloated), 1x Slow, 4x Speedy, 1x Slow
	Trapper	Mr. Unexcitable. Still the same depressing lump of zombie guts, huh? It's good to see you too. File:RockBottomWave3-2.ogg
4	-		1x Normal Boss, 11x Slow, 1x Normal Boss
5	Commander	We need a way to the city. Are you able to take us there? File:RockBottomWave5-1.ogg	6x Skeleton, 2x Hidden, 6x Skeleton, 5x Normal
	Trapper	Hold on — one's getting close. Hee-yup! Haha! Anyway, of course I can! I've been working these mines for years, well before these freaks showed up. There's an entrance to this cave not far from here. Just — ah... just don't step on anything with whatever you're trying to keep. File:RockBottomWave5-2.ogg
6	-		5x Slow (Bloated), 1x Necromancer, 1x Normal Boss, 1x Normal Boss (Bloated)
7	Sniper	Why are you down here anyway? The last time I saw you — you were arguing with the recruitment officer about being kicked out of training. File:RockBottomWave7-1.ogg	3x Normal Boss (Bloated), 12x Slow (Bloated, Nimble), 10x Hidden, 7x Skeleton (Bloated), 1x Normal Boss (Nimble)
	Trapper	Because he was blaming me for letting one of the guys step in a bear trap! Sure, it might've been me, but not that they could prove it. Turns out I have a gift and the city needs crystals. So I stay in that little hut over there for a few days and make sure things are safe. For the most part. File:RockBottomWave7-2.ogg
8			2x Normal Boss, 3x Skeleton (Bloated, Nimble), 3x Armored, 3x Skeleton (Bloated, Nimble), 2x Normal Boss, 3x Armored, 4x Skeleton (Bloated)
9			4x Normal Boss, 10x Armored, 1x Slow Boss, 15x Slow (Bloated, Nimble)
10	Trapper	Gotcha! Ah— bleh. I think I just tasted some of its thoughts. Honestly, I thought there'd be more of ya! Lots of weird voices coming from the mines today. Heard some before you guys set off my mine. File:RockBottomWave10-1.ogg	1x Slow Boss (Hidden), 7x Hidden (Bloated), 1x Necromancer, 1x Necromancer (Bloated), 7x Hidden (Nimble, Bloated), 1x 1x Slow Boss (Hidden)
	Soldier	Voices? Wait. Are there other ways into the mine? File:RockBottomWave10-2.ogg
	Trapper	Yeah, some even connect to the river since we gotta wash the crystals off, but... uh. Should you be worrying about that right now? File:RockBottomWave10-3.ogg
11	Commander	Take us to where the city is. We need to get in contact with headquarters and get out of the cave. I'm starting to hear more of your traps go off. File:RockBottomWave11-1.ogg	10x Skeleton (Bloated, Nimble), 4x Armored, 4x Normal Boss (Bloated, Nimble), 4x Armored, 2x Necromancer (Bloated),
	Trapper	Ugh. Great. Follow me! Before you guys end up giving me even more work. Especially you, Minigunner. File:RockBottomWave11-2.ogg
12	Commander	Come on, Recruit! Whatever's behind us isn't slowing down. I've never seen a horde like this. File:RockBottomWave12-1.ogg	8x Hidden (Bloated, Nimble), 8x Armored (Nimble), 1x Necromancer (Bloated), 4x Armored (Bloated), 1x Necromancer (Bloated), 1x Giant Skeleton (Bloated, Boss)
	Sniper	The way they're moving has me thinking something is leading them. File:RockBottomWave12-2.ogg
	Commander	Go with the rest of the team. We'll be right behind you! File:RockBottomWave12-3.ogg
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

COPIED FROM ROCK BOTTOM AS PLACEHOLDER

Wave 1-12

• File:(Official) Tower Defense Simulator OST - Synthesia

Update History

• 7 August 2026 - v2.5.0
  • Rock Bottom added.

Notes