Castle Watch: Tower Defense

Build towers, stop the goblins before they reach your castle.

Goblins are marching along the path toward your castle, and the only thing between them and the gate is what you decide to build. Castle Watch is a tower defense game that runs right here in the browser - nothing to download, no account to make, and no ads cutting into a wave. Place towers on the grass beside the path, spend the gold you earn on more towers or better ones, and see how long you can hold. The first waves are gentle enough to learn on. The last ones are not.

How to play

1. Tap any empty patch of grass to open the build menu. An Archer Tower costs 50 gold, a Bomb Tower costs 70.
2. Archers shoot fast but hit one goblin at a time. Bombs are slower and hit everything in a small blast - you will want both.
3. Tap a tower you already own to upgrade it (three levels) or sell it back for 60% of what you spent on it.
4. Press START when you are ready. Nothing happens until you do, so there is time to think and build.
5. Every goblin that reaches the castle costs you one life. Run out of lives and the castle falls.

Why it is not just clicking

The interesting decision is the mix. Barrel goblins are the fastest thing in the game, but they break after 34 damage and they arrive in a rush - that is exactly what a bomb tower is for. Bombers and the Yellow Chief carry 260 and 420 health, and splash damage barely scratches them; those want upgraded archers pouring everything into one target. Build only one kind of tower and you will be comfortable until about wave seven, and then you will lose. Working that out is the game, and it is the same puzzle whether you are eight or thirty-eight.

Night and rain

From the third wave on, the sky starts to matter. When a small moon appears in the corner, night is coming and your towers will aim more slowly in the dark. When clouds gather, rain is on the way and the goblins will run faster through it. Both are announced a whole wave in advance and never arrive together, so the weather is something to plan around rather than something that happens to you.

How hard is it?

Three maps, three difficulties and two modes, so the game meets you where you are. Easy starts you with 22 lives and a generous purse and keeps the weather mild. Hard gives you 16 lives, less gold and harsher nights, and the bot we balanced the game with cannot beat it. Endless mode drops the finish line entirely and keeps escalating for anyone who wants to find their ceiling.

Is it right for younger players?

There is no age you have to be. The controls are two taps - one to build, one to upgrade - and the reading is numbers and short labels, so children read enough to play it well before they read fluently. The first two waves are a handful of slow goblins and nothing else, and a new enemy type appears every couple of waves, so the game explains itself as it goes. Around six or seven is a comfortable starting point on Easy, often with someone sitting alongside for the first run; from there the difficulty settings carry a player as far as they want to go.

For parents

There are no ads, no pop-ups, no sign-up and nothing to buy. The game runs entirely in your browser and collects nothing - the best wave you reach is remembered on your own device and goes no further. We made this game ourselves rather than licensing it, which is why there is no advertising attached to it. A campaign run takes roughly eight to twelve minutes and then it ends, so it fits the time you have instead of pulling for another session.

In the classroom

It is a compact lesson in spending under scarcity: limited gold, a standing choice between more towers or better towers, and immediate visible feedback on whether the call was right. Players have to notice that fast fragile enemies and slow armoured ones need opposite answers - a real classification problem hiding inside a game. A campaign run is about ten minutes and the three maps give three different path shapes to reason about.

Questions