Tower Lab Synergies

Tower Lab does not award a hidden “combo multiplier” when two cubes share a tag. Synergies are physics. If a Fan can push a body, and Gravity can orbit that body, then Fan plus Gravity is a spiral whether or not the UI draws a heart between them. This page is the practical list of machines that showed up in official videos, playtests, and the public demo. Steam Early Access is scheduled for September 7, 2026. Treat every recipe as a starting diagram, not a patched meta.

Read the tower roster if you still need roles. Spend Tech Points using upgrades and tech trees. When a shop tries to sell you a lonely S-tier name, remember the tower tier list caveat: synergies beat isolated ranks.

Physics combos beat isolated cubes

A wave is a pile of mass with a path painted on the floor. Your job is to take that mass off the lab. Four jobs cover almost every winning board:

• Hold: Gravity, Bola, Cryo, Imploder, Harpoon.
• Shove: Fan, Tesla, Kinetic, Pulse, Bomb, Rocket, Mine.
• Lighten or redirect: Shrink, Split, Deflector.
• Cash or scale: Grow, Grinder, Constructor, Merge.

If your hand only shoves, heavy robots walk through. If your hand only holds, the well overfills and leaks. If you only cash, you die rich. Build at least two jobs, then let the third show up in the shop.

Shrink enemies, grow projectiles in Tower Lab

Fan plus Gravity

Gravity pulls nearby objects into orbit, including projectiles. Fan adds a directional gust. Together they create the moving spiral from the official Gravity video: the well holds the cluster, the wind drags that orbit across the lab, and robots leave the path without a damage number. Place Gravity first on a pit or a corner, then aim Fan so the spiral’s outer edge crosses an exit you control, not the robot exit.

You can park a Pulse or a Bomb in the same well. The projectile becomes a turret that rides the spiral. That is why Gravity is a control cube that buffs offense without a scripted aura.

Shrink, then Fan

Shrink makes knockoff easier. Fan is a directional shove. Shrink then Fan is the cleanest early-region machine in the game. You do not need a pit. You need a lighter body and a gust aimed at an edge. If the shop offers Shrink while you already hold Fan, take it before a third offense cube.

Shrink also feeds Split. Split halves mass and copies the object. A halved body that you then Shrink is almost a free knockoff, and the copy can be shoved in a second direction. That is a control loop, not a clone exploit. The official Split path exists because cloning clones broke the lab.

Grow the projectile, not only the robot

Grow is two different cards in one cube. Grown robots drop more Matter and are harder to knock. Grown projectiles hit with more force. The official Shrink/Grow video is the reason this page embeds that clip in the middle of the article.

The safe Grow pattern is: Shrink the robot, Grow the payload. Bomb, Rocket, Mine, and Pulse all benefit. Deflector lets you loop a grown Bomb until it detonates in the right place. Kinetic is the exception that still plays: its orbs ignore gravity, so you Grow them for force and bounce them for coverage rather than capturing them in a well.

The greedy Grow pattern is: Grow the robot, knock it anyway, cash the Matter. That is the matter farming line. It needs a stronger shove than Shrink-then-Fan. Tesla on copper, a Gravity dump off a ledge, or a grown Bomb are the usual finishers. If you Grow a robot and then fail the knockoff, you have donated a heavier leak to the exit.

Tesla on copper

Tesla zaps with high knockback and prioritizes conductive materials. Copper is the friend. Rubber is the enemy: high resistance, reduced knockback, last in the target list, extra bounce, extra friction. A Tesla machine is not “place three Teslas.” It is “point Tesla at copper, Shrink the rest, and have a Fan for the bodies Tesla ignores.”

Stack Double Strike and chain-to-nearby on the upgrades page so each pulse covers a crowd. Do not dump every Tech Point into Tesla if the next region is rubber-heavy. Materials are the counterplay, not a hidden DPS patch.

Grinder conveyor lines

Grinder turns robots into Scrap. The confirmed follow-up is a Conveyor Line off its output so Scrap travels. That is a production machine. You can dump Scrap off an edge for a clean void, Grow it into a heavier payload, Merge it, or feed Constructor so the lab grows mid-run.

A Grinder with no conveyor is a bin. A Grinder with a conveyor and no knockoff edge is a museum. Place the input toward the lane, the output toward a useful destination, and a control cube (Fan, Deflector, Gravity) so leftover robots still leave the map.

Deflector redirects

Deflector is plumbing. After the rework, bombs, mines, and units bounce. Chain Deflectors into a mine conveyor. Loop a grown Bomb. Bounce Kinetic orbs into a barricade robots have to brute-force. Two Kinetic cubes plus a Fan already form a shotgun; Deflector turns that shotgun around a corner.

If a projectile keeps dying in a wall, the fix is often a Deflector, not a second shooter. Read the tower roster Deflector note before you sell the cube because it “does no knockback.”

Grow-then-knock for Matter

Matter is the shop. Grown robots pay more. The disciplined version of greed is a three-step line: Grow the body, hold it (Gravity or Bola), then knock it with a scaled payload. The sloppy version is Grow into an open lane and hope Fan still wins. Hope is not a synergy.

Constructor belongs in this conversation as the long-run cash partner. Grinder makes Scrap now. Constructor grows the factory so later stages have more cubes on the board. Neither one knocks a boss-sized robot by itself. They exist so your starter decks can afford the cubes that do.

Before you press Start Attack, name four jobs out loud: what holds, what shoves, what lightens, and what cashes. If a job is empty, spend Energy on a cube that fills it instead of a second copy of the job you already have. Then open matter farming if the shop is starving, or starter decks if the hand is a pile of names with no machine.