Tower Defense, Explained in 10 Waves

A wave-by-wave guide to Toolnex's Castle Guard Defense · 7 min read

Tower defense looks like a game about shooting, but it's really a game about geometry. The enemies follow a fixed path to your castle; your job is to make that path as expensive as possible. This guide walks through the first ten waves of Castle Guard Defense and the placement logic that carries you past them.

The core idea: lengthen the kill zone

Every tower you place should force enemies to spend more time in range of your guns. A tower at a bend in the path covers two approaches at once. A tower on a straightaway covers one. That difference is the whole game.

Waves 1–3: establish the corner

Don't spread out. Put your first two towers at the first bend enemies hit after entering. This creates an overlapping zone where early, weak enemies die before reaching the midpoint. Bank the gold from those kills rather than spending it on a third tower too early.

Waves 4–6: upgrade before you expand

Around wave 4, enemies get tougher. This is the moment to upgrade your corner towers rather than buy a new one. A level-2 tower at a bend outperforms two level-1 towers placed apart, because it pumps more damage into the same overlapping zone.

Waves 7–8: cover the second bend

By wave 7 you can afford a small expansion. Place your next tower at the second bend, creating a second kill zone closer to the castle. Now enemies cross two heavy zones instead of one. Keep your gold reserve above zero — waves 9 and 10 spike.

Waves 9–10: the spike

The final waves send faster, denser groups. Two tactics help:

• Backfill the gaps. If a stretch of path has no tower nearby, plug it now — a fast enemy crossing a dead zone is a castle hit.
• Prioritize the bend nearest the castle. Late enemies that survive the first zone must not survive the second. Over-invest there.

A quick placement checklist

• Is this tower on a bend or a straight? (Bend = good.)
• Does it overlap another tower's range? (Yes = good.)
• Am I upgrading before expanding? (Usually yes.)
• Is the zone nearest my castle the strongest? (It should be.)

Castle Guard Defense saves your progress locally, so you can replay wave sets to refine placement. The game rewards patience over reflex — which is exactly why it's a good brain break.

Want a deeper breakdown of a specific wave? Let us know via the contact page.