Ball TD - Pinball Physics Tower Defense Game
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About this game
Ball TD fuses pinball physics with tower defense. Enemies march down a three-lane corridor from the top, and your only weapon is a bottom cannon that fires steel balls. Drag on the field to aim, release to fire: each ball flies with mirror reflections, carries three bounces, and damages every enemy it touches. Bumper towers are the heart of the build - a ball that hits one reflects and speeds up by 15%, and faster balls deal more damage, so a well-placed bumper turns a straight shot into a ricochet storm. The other five towers are amplifiers: a gunner chips the deepest enemy in range, a frost ring slows everything walking through its aura, a mint pays gold after every wave, a prism has a 30% chance to split any ball that touches it into two, and a magnet pins a passing enemy in place for half a second. Heavy armor shrugs off bullets and must be broken by balls, flyers can only be hit by a ball that has not bounced yet, and every fifth wave brings a boss with two points of leak damage. You hold five balls per wave, kills refund 20% and the magazine slowly refills, and any enemy that reaches the bottom costs you base HP. Clear all fifteen waves to unlock Endless, where enemy HP and count grow 18% per wave until your defense finally breaks. Every run earns score from kills, wave bonuses and a x2 combo multiplier whenever a single ball kills two or more enemies. A Daily Challenge seeded by the UTC date gives every player the same wave compositions and the same four-tower shop for that day, with its own best score and a streak that grows day by day. Towers can be sold for 60%, the cannon itself can be upgraded with gold, and all sound is synthesized with a mute switch that remembers your choice.
How to play
Build phase: tap a tower card, then tap a glowing slot beside the corridor; tap SELL and a tower to refund 60%, or upgrade the cannon with gold, then press START WAVE. Battle phase: press and drag on the field to aim the bottom cannon and release to fire. Balls bounce three times, damage every enemy they touch, and are recycled when they fall back down. Stop enemies before they reach the bottom of the screen.
Tips & Tricks
- Bumpers pay twice: they redirect balls back into the enemy column and the 15% speed-up also raises the damage of every later hit.
- Flyers ignore bullets and bounced balls, so when only flyers remain, aim carefully and fire a fresh, unbounced ball straight at the predicted spot.
- A single ball that kills two enemies scores x2 combo on the second kill, and every kill refunds ball ammo, so thinning crowds early keeps the magazine full.
- Save gold for cannon upgrades once your twelve combat slots are full - a higher cannon level keeps balls relevant against wave-15 boss HP.
Frequently asked questions
Why do I lose even though I keep firing?
Balls alone cannot hold the corridor past the early waves - heavy armor takes full ball damage but your limited balls cannot clear the whole column. The design is verified by simulation: without towers a pure-ball run cannot survive wave 8, while a standard tower array clears all 15 waves. Towers amplify the balls, balls do the damage.
How does the daily challenge work?
Every day, based on the UTC date, all players get the same enemy compositions for each wave and the same rotating four-tower shop, driven by a fixed seed. Finishing a daily run checks you in and grows a streak; replaying the same day does not change the streak, and your best daily score is stored separately from the normal best.
What happens after wave 15?
Clearing wave 15 wins the run and records your score. You can then continue into Endless from the result screen: enemy HP and count grow 18% per wave, your wave-gold income scales the same way, and the run ends only when your base HP runs out.
