Slot: Semiconductor Defense

Spin the slots, draw units, and defend the semiconductor factory.
One-time purchase, full content forever. No ads, no IAP.
A serious slot tower defense — 40 waves × 7 difficulties.

▶ Core Mechanics
Slot Machine
- Collect coins, spin the slots, and acquire units
- 5 grades: Common · Uncommon · Rare · Unique · Legendary — 29 units total
- Slot costs stack up within a run — balance risk and saving

Grid Placement
- 12×7 grid, S-shaped loop path
- 4 attack types: Single · AOE · Pierce · Support
- Combine 3 of the same unit → upgrade to higher grade (17 recipes)

40 Waves × 7 Difficulties
- From Intern (Easy) to Director (Very Hard)
- Diverse enemy gimmicks — Dash · Split · Shield · Phase · Aura Heal
- Boss waves at 10, 20, 30, 40

Permanent Upgrade System (3 layers)
- Meta Tree — Global upgrades (all units/enemies/economy)
- Grade Upgrade — per-race × grade (within a run)
- Unit Upgrade — individual unit permanent leveling (max Lv 20 + milestone bonuses)

▶ Features
- One-time purchase — no ads, no IAP, no subscription
- Landscape mobile optimized
- One run ~30 minutes — finishable on a short commute or break
- Offline play — no network required

▶ Credits
Music by Kevin MacLeod (incompetech.com), CC BY 4.0
SFX by Kenney (kenney.nl), CC0