Aurora Sentries#074

Description

Watch-towers gain power when the aurora curtain overhead matches their color; curtains migrate on cycles, so you recolor sentries between waves. Signature: tune three towers under the rare crimson ribbon for the ion storm.

Green-violet aurora ribbons over star fields, dark snow plains, silhouette pines, cold teal glow.

How to play

Click, Enter or Space to start. Place and upgrade towers with the mouse and number keys, or by tapping on touch, to stop each enemy wave before it reaches your goal. The HUD tracks lives, cash and wave.