Bosses
Each of these three costs several lives if it reaches the base.

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Giant Worm
Boss, heavily armoured, slow
Wave 10Ground5 lives
A massive burrowing worm boss.
Explore Enemy -

Blimp Boss
Boss, flyer
Wave 20Flying10 lives
A massive Level 20 aerial fortress.
Explore Enemy -

Mech Boss
Boss, heavily armoured, slow
Wave 28Ground10 lives
A towering war mech in navy and gold armour, with a rotary cannon arm, a missile pod on each shoulder and a glowing reactor core.
Explore Enemy