K (KunaiPlus)

Strategy and Synergy
KunaiPlus directly improve the efficiency of kunai engines, by increasing the output. This is particularly noticeable with.

The only drawback is the upgrade rarity, sometimes there will be instances of going 2, 3 or even 4 times through the upgrades selection without a single K (KunaiPlus) appearing. If the player is lucky enough, though, it may appear as an upgrade option the first or second time. If aiming exclusively for KunaiPlus, spare your, as it is cheaper to just skip the upgrades rather than picking another of the options, because every upgrade applied increase the upgrader cost by 1.