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The Decagon was added at August 5, 2018.


The Decagon is huge orange decagon that is about 1.5 times larger than alpha pentagon.


The Decagon has 600 health and gives about 25,000 experience upon destruction. It can randomly spawn where density of rare polygons (Ex.shiny & sunburnt polygons, high-evolution polygons, golden polygons) and sanctuaries are high, the chance being higher the more of them are concentrated in one place. At places where 3 or more sanctuaries or 3 heptagon and above shapes are very close to each other, the chance of decagon spawning becomes near 100%. Decagon has higher resistance compared to Nonagon, that's why it is noticeably harder to kill.


Since decagon is very likely to spawn when there is rare polygon, try letting rare polygons alive for some time. Or you can try putting bunch of rare polygons and sanctuaries together with Aegis, forming decagon farm (make sure to invest lots of points into lance). When decagon spawns, it is huge score boost for any tank. however be aware of other tanks because they will likely to destroy rare polygon before decagon spawns. Also, remember that decagon has extreme speed upon spawning, and can straight bump and destroy your tank if it spawns right next to you.

If you have reached the highest tier and have a high DPS, like Splitter, you can destroy Decagon for its experience. As a tanks with lower tiers, you will unlikely be able to destroy Decagon without wasting too much time. You can also use Decagon in defensive purposes against Bots, if you are unable to defend by yourself. In this case, you can move behind Decagon and trick bot into ramming Decagon and taking massive damage. This will force the bot to retreat.


Decagon on death screen. There was green beta pentagon right at the top left of decagon before it was obliterated by AI.

A decagon along with few very rarely-seen polygons. As shown in image, another decagon is being spawned at bottom left, and this can trigger chain reaction where density of rare polygons rise and spawn more decagons.

Simple Shapes EggSquareTrianglePentagonBeta Pentagon
Splitter Shapes Splitter SquareSupersplitter SquareSplitter PentagonSplitter HexagonSplitter Decagon
Green Shapes Green Square • Green Triangle • Green Pentagon • Green Beta Pentagon
Orange Shapes Orange Square • Orange Triangle • Orange Pentagon
Golden Shapes Golden Egg • Golden Nonagon • Golden Icosagon
Alpha Shapes Alpha PentagonAlpha HexagonAlpha HeptagonAlpha OctagonAlpha NonagonAlpha Decagon
Sanctuary Spawned Shapes Giant EggGiant SquareGiant TriangleGiant PentagonBowed Sanctuary SquareSnowball
Removed HexagonHeptagonOctagonNonagonDecagonIcosagon
Special Black Pentagon
Normal Egg SanctuarySquare SanctuaryTriangle SanctuaryPentagon SanctuaryGolden SanctuaryCrasher SanctuaryBowed SanctuarySnowball Sanctuary
TESTBED Mega Sanctuary