Level-up chains: Lab Rat, Concabulator and Overhaul

Lab Rat levels up whenever an adjacent plot levels up, with no maximum level. A level-up next to one Rat therefore levels the Rat too, and if that Rat sits next to another Rat, the second one levels as well. The chain starts from anything that levels a plot: an upgrade, Wildcard, Overhaul, a level-3 Concabulator and, since Patch #29, Patronage.

The pieces

Card	Role in a chain
Lab Rat	Levels with each adjacent level-up; no level cap
Concabulator	On reaching max level (3), levels every plot once
Overhaul	Destroys a plot to level up 2 random plots; each use levels one more plot than the last
Recycler	Not a level source: +2% damage and HP per level to neighbours for each card thrown into the pit
Executioner	Ranged troop that targets the lowest-health enemy; Futurism lets every troop reach level 99
Gentrify	Decree: every active plot gains a level

Worked chain

Start: a row of three Lab Rats at level 1 with a level-2 Concabulator at one end, adjacent to the first Rat. Play a second Concabulator on it (level 3):

1. The Concabulator reaches max level and levels every plot once: each Rat goes to level 2.
2. Each Rat’s level-up is an adjacent level-up for the next Rat in the row, so the middle Rat (two neighbouring Rats) and the end Rats gain further levels from their neighbours.

Patch #06 limited Concabulator itself to one level per plot, while the Rat domino effect still runs, so the extra levels come only from Rats touching Rats. Long chains of Rats, or Rats packed around a central level source, produce the most levels per trigger. Chain Chain Chain Reaction (1.0) asks for a Concabulator that triggers a second and then a third.

Reusing Concabulators

Earthworks returns up to 3 copies of the target card when it unlocks plots, so using it on a spent Concabulator plot gives Concabulator cards back (a broken source returns fewer: 2 in the data). Jumpstart (1.0) replaces your hand with 3 Overhauls and 3 Broken Cabulators. For Scraps asks you to Earthworks a Broken Cabulator.

Level cards from other pools

• X-Ray (Rainbow): levels every plot diagonal to the target beyond max level. It’s Super Effective needs one X-Ray to level 5 plots.
• Mantra (Rainbow, 1.0): the bearer gains +3% all stats per stack whenever any plot levels up, so it profits from every link in a chain.
• Amplifier (Time): passes level-ups it receives to neighbours since Patch #23.

Level achievements

Ratticus the First (a Lab Rat at level 99, 16.8%), Great Leap (level up plots 9 times in one turn, 1.0), King of the Hill (base at level 9, 41.8%) and Welcome to my Crib (a base 3 levels above its cap, 1.0).