Enemy missiles fall toward your fortress. Type a missile's word to shoot it down before it lands. Every hit that gets through costs a base-health segment — lose them all and the run ends. Clear all the missiles in a wave to advance; every sixth wave is a boss.

Waves get harder as you go: missiles spawn faster and the words attached to them grow longer, up to 12 characters at the higher waves.

Start typing a word's first letter to lock on to that missile — the cannon fires with each correct key. You stay locked until the word is finished, so choose deliberately.

Tab drops your current lock with no combo penalty, freeing you to retarget a faster, closer missile. Use it when you've committed to a long word and something more urgent appears.

• WAVE (top-left) — current wave number.
• SCORE (top-right) — points from kills and combos.
• BASE HEALTH (bottom bar) — segments left before the fortress falls.
• Combo number — consecutive correct keys; higher combos score more, and a run of 50+ in a row starts earning bonus XP on top of the score, for as long as it holds. A mistype resets the combo (and the bonus) back to zero.

• 1 EMP — clears every missile on screen. Also fires on Space.
• 2 Timewarp — slows every missile 75% for 10s.
• 3 Shield — an energy arc that blocks the next 4 hits.
• 4 Auto-Track — the computer intercepts missiles for 10s.

Charges are earned from pickups during play; a slot is greyed out when empty.

Some falling words are pickups, not threats — type them to collect:

• Life Capsule — refills one base-health segment, up to your current max. Shows up roughly every 4-5 waves.
• Prismatic Laser — a one-time weapon upgrade that appears during a single random wave (somewhere between waves 8-10) — while it's active, your shots chain to nearby missiles instead of hitting just one.
• Recharges for Timewarp, Shield, EMP, and Auto-Track.

A boss appears every 6th wave, 10 in total through wave 60. Instead of falling missiles, you're shown a pane of words to clear before a 20-second timer runs out — miss the timer and the fortress takes a breach. The pace required climbs with each boss: an early boss asks for a modest typing speed, the final one demands real speed. Keep your combo up and don't panic. Bosses are also worth far more score than a normal kill.

Score comes from missiles destroyed, your combo streak, and boss clears (worth a large flat bonus each). At the end of a run, a share of your final score converts into coins — spend them on permanent, account-wide Missile Defense Upgrades (the Upgrades button, in-run or from the main Shop), which apply starting your next run, not the one you bought them mid-run.