If you open Army Defense in the browser today, you will not find a lane-by-lane tower defense. The web build at tyttoot.com is now a sky battle called Tam Giới Đại Chiến (Tam Gioi War in English): you summon hosts from three realms, they fly or ride clouds across the sky on their own, and the first side to drain the other's Sanctum wins. It plays in the browser; the Play box at the end of this article shows where it is live.
We played the web version on 21 October 2026 in a 1280×800 window with a mouse, against the computer on 1P Easy. We lost the first match badly and won the second. Our in-match screenshots show the game's Vietnamese interface, the language it opened in; the menus below are in English.
Pick a sky, then a mode
After the title screen you choose a realm battlefield: Heaven Gate (golden clouds), Mortal Frontier (ink peaks) or Nether Rift (violet fog). The realm sets the sky you fight under. Then pick a mode: 1P Easy, Normal or Hard against the AI, Local 2P on one screen (left tray for player 1, right tray for player 2) or 2 AI to watch the computer fight itself.
What the How to Play panel says
- Summon. You do not place units. You select a host in your tray, and it keeps summoning itself whenever you have the gold.
- Battle. Hosts move and fight by themselves. Your job is the army mix.
- Income. A timer in the middle of the top bar counts down and feeds gold to both sides.
- Miners. Workers dig spirit stones near your keep and never fight.
The tray, and why a host card matters
Your tray sits bottom left (the AI's is bottom right). Each card shows cost, an income bonus such as +1, and summoned / limit. Tap a card and a detail panel opens. Ours for the Bow Fairy read: cost 50, pop 1, income +1 per summon for the rest of the match, HP 45, damage 11, range 180, ranged attacks only, element Wood (beats Earth, weak to Metal).
Two numbers rule the match: your population (28 at most for each side) and each host's summon limit (the Bow Fairy stops at 5).
Match one: we lost in minutes
We tapped several cards one after the other, hoping to summon a bit of everything. That only kept changing the selection. Our army never grew, the AI reached 28/28 population while we had almost nothing, and its hosts walked into our Sanctum.
Match two: miners first, then a host
This time we followed a plan:
- Miners first. The bottom row of the tray holds the workers. The first one cost 30 and added +3 income, with a limit of 2. We summoned both, then both of the next worker (55, +4) and later the third kind (90, +5). Our income went from +40 at the start to +63 and then +85.
- One cheap ranged host. We selected the Bow Fairy and let it summon until it hit its limit of 5.
- Keep switching to cards that are not full. Our mistake of the match: once the Bow Fairy and then the 90-gold host we picked next were at their limit, the selected card could not summon any more and our gold piled up to 3,046 while our population dropped to 8. From then on we moved the selection to a card that still had room every few seconds.
Late in the match we switched on the auto pick toggle next to the VS badge, which picks hosts for you; by then our army was already ahead. The fight stalled in the middle of the sky for a while, then our side pushed through. At the end the AI was down to 5/28 population while ours was full, and our hosts reached its Sanctum.
The win screen added a line we liked: the game saves your winning strategy for the AI, so the computer learns from the way you beat it.
Tips for your first win
- Select, then wait. One selected card keeps summoning. Flicking between cards summons nothing.
- Fill the worker row first. Miners never fight, but each one raises your income for the whole match.
- Watch the limit, not just the gold. When a card shows its limit (5/5), move on. A big gold number is a warning sign.
- Read the element line. Every host lists what it beats and what it is weak to. Mix elements rather than stacking one.
- Start on 1P Easy. The AI fills its population fast; learn the economy before trying Normal or Hard.
