Underdark:Defense, from LiberalDust, is an iPhone strategy game where you protect the Eternal Flame from encroaching dungeon monsters. It pairs tower defense maze-building with a roguelike drafting loop that presents randomized buffs as you level, and lets you place towers and field hero guardians with unique abilities. The title includes equipment, crafting, and pets, and targets strategy and roguelike fans who want deep, on-the-go tactical matches.

A tower defense core that pivots into roguelike decision-making

The game blends maze-style tower placement with a run-based buff system.

Co-op and hero systems shift how you approach waves

Online cooperative play changes pacing and role choice.

Art and controls emphasise atmosphere and single-thumb play

Hand-drawn dark fantasy visuals reinforce the light-versus-dark premise.

Progression and replay hooks reward repeated runs and investment

Long-term goals sit behind meaningful meta-progression.

A mature mobile strategy pick backed by an active indie studio

Underdark is a confident choice for players who value ongoing content and a studio with a track record: the developer is a South Korean independent team whose other titles collectively reached millions of downloads. The game receives new content roughly every two weeks and holds a near-perfect store rating, so it suits players seeking continued support. Practical constraint: Apple devices require iOS 13.0 or later.