A build is a covered board with one merged spike. Both have to hold the spike.
Coverage first
Cover every lane before you deepen one. A board with a maxed unit and a hole loses to the hole. Spread, then merge into the weak lane.
The spike
One merged unit for the boss wave is the spike that clears it. Merge into a role the board wants, not the one the shop pushes. The spike multiplies a pair.
Fit the shop
Take units the shop offers that fit your lanes. A perfect build you cannot field is worse than a plain one you can. The run has your shop, not the list’s.
Read honestly
A tier list ranks ideal kits. Your board has your waves. Take the build that uses what you have and covers what the next wave sends.
The synergy guide shows which roles combine, so the spike you merge multiplies.
A board that survives the spike
A working build has a frontline tank in every lane, a damage bonker behind it, and one support or economy bonker feeding gold. Merge into the pair the synergy guide names — a tank-plus-dps combo that multiplies beats two unmerged singles. Save one lane’s gold for the spike wave so you can drop a merged unit right before it hits.
Don’t spread thin
Resist buying one of everything. A board of three merged lanes outperforms six weak ones. The synergy guide tells you which roles combine, so the unit you merge actually multiplies the pair instead of sitting alone. Build toward that board, then scale it.