Cosmo Brawl Stars: Complete Guide, Best Build & Best Modes (2026)

Cosmo is the newest Mythic Controller in Brawl Stars, and he plays exactly like his lore suggests: the lead astronomer of Starr Park's Observatory turns the area around him into his own solar system. Instead of trading single shots, Cosmo builds a zone that enemies simply cannot walk through for free — which makes him a control pick rather than a damage pick. This guide covers his kit, the best build (gadget, Star Power and gears), the strongest modes and maps, his weaknesses, how to counter him and how to unlock him. Because Cosmo is a recent release, there is not yet a statistically significant win-rate sample, so every recommendation here is preliminary and gets updated as real data arrives on the live Cosmo page and the Cosmo build page.

Who Is Cosmo? (Starr Park's Astronomer)

Cosmo is the lead astronomer at Starr Park's Observatory. Besides teaching visitors about the universe, he spends his nights gazing at the stars searching for something — and that obsession is baked into his design: telescopes, orbits and planets. In gameplay terms he is a Mythic Controller, the role that wins matches by denying space rather than by killing fast. If you like brawlers such as Emz, Amber or Mr. P — picks that make the enemy uncomfortable every second — Cosmo will feel natural. If you only enjoy burst damage, he will feel slow until you learn what his zone is worth.

Key points

• Role: Controller — his value is area denial, not raw damage.
• Rarity: Mythic, so unlocking him is a mid-term project, not instant.
• Skill floor is low, but his ceiling depends on positioning discipline.

Cosmo's Kit Explained (Attack, Super, Gadgets, Star Powers)

Cosmo's main attack revolves around him in an orbit, hitting anything that gets close and rewarding you for holding ground near objectives instead of chasing kills. That single detail defines the whole brawler: he is strongest exactly where the objective is. His Super continues the theme by pulling and displacing enemies, which turns a lost lane into a free reset for your team. His two gadgets do very different jobs. Planetary Pushback knocks enemies back from the targeted area, so it is your panic button against divers and your tool to shove opponents off the gem carrier, the Hot Zone circle or the safe. Telescope Trap reveals an area for a few seconds, including invisible enemies, and blocks movement abilities inside it — no dashes, jumps or teleports. That is a genuinely rare effect: it hard-punishes Mortis, Edgar, Max, Leon and Kenji-style dive comps. For Star Powers, Precession increases the orbit speed of his main attack, which means more consistent damage on anyone standing in his zone, while Ammo Attractor reloads ammo when his Super hits enemies, which keeps his pressure looping in long teamfights.

Key points

• Planetary Pushback: knockback from the targeted area — anti-dive and objective control.
• Telescope Trap: reveals invisible enemies and disables dashes, jumps and teleports inside.
• Precession: faster orbit, more consistent zone damage.
• Ammo Attractor: Super hits reload ammo, keeping pressure alive.

Best Cosmo Build 2026 — Gadget, Star Power and Gears

The recommended starting build is Planetary Pushback plus Precession. Pushback is the safer first unlock because it solves Cosmo's single biggest problem: assassins and tanks walking straight into his face. Precession is the better first Star Power because it improves the thing you do in every single match — holding a zone and damaging whoever contests it — instead of depending on landing Supers. Once you own both, treat the second gadget as a map-based swap: pick Telescope Trap when the enemy draft has invisibility or dashes (Leon, Mortis, Edgar, Max, Kenji) or on Showdown maps full of bushes, and keep Planetary Pushback for Gem Grab, Hot Zone, Heist and Brawl Ball where physically shoving enemies off the objective wins rounds. Ammo Attractor becomes the better Star Power in longer modes where you cycle several Supers per fight. For gears, Gadget Charge and Shield are the safe pair on a Controller who wants to survive contests; Vision is a strong third option on bushy maps, and Speed is fine when you need to rotate between two objectives.

Key points

• Start with Planetary Pushback + Precession — the safest all-round build.
• Swap to Telescope Trap against dashes and invisibility.
• Gears: Gadget Charge + Shield, with Vision on bushy maps.

Best Modes and Maps for Cosmo

Cosmo is a mode-defined brawler: the closer a mode is to standing on one spot, the better he gets. Hot Zone is his best home because the objective literally asks you to occupy a circle, and his orbit punishes everyone who steps in. Gem Grab is a close second: he can body-block the mine, cover the carrier and push enemies out with the gadget at the exact moment they commit. Heist works well because the safe never moves, so his zone always sits on top of the thing that matters. Brawl Ball is strong on maps with walls near the goal, where his Super and knockback break clean scoring runs. Knockout and Bounty are situational — long open lanes let snipers poke him before he ever reaches useful range — and Showdown is playable with Telescope Trap to expose bushes, but he is not a top solo pick. Check the live map rotation before you commit, because the current active maps decide whether he is a comfort pick or a trap.

Key points

• Best: Hot Zone, Gem Grab, Heist.
• Good with walls: Brawl Ball.
• Situational: Knockout, Bounty, Showdown (Telescope Trap).

How to Play Cosmo (Positioning and Super Timing)

Play Cosmo as an anchor, not as a chaser. Pick the tile your team needs — the gem mine, the zone edge, the wall in front of the safe — and make crossing it expensive. Never walk into open ground to finish a low-health enemy; that is exactly how a Controller dies for nothing. Hold your gadget until an assassin actually commits, because Pushback used early is a wasted defensive charge. Use the Super to reset a fight you are losing rather than to start one: pushing two enemies off the objective at once buys your team more than a single kill. In Ranked, he is a comfortable second or third pick on control maps, and his gadget flexibility makes him a decent answer once you see whether the enemy drafted dive.

Cosmo's Weaknesses and How to Counter Him

Cosmo's weakness is range. Everything he does happens near him, so any brawler that can damage him from outside his orbit forces him to move — and a Controller out of position contributes almost nothing. Long-range marksmen and throwers are his cleanest counters: Piper, Brock, Angelo, Tick or a wall-safe thrower can chip him down while he can only retreat. Heavy tanks with shields can also walk through the zone if he has already used his gadget, which is why counter-play against him is mostly about baiting Planetary Pushback first and committing second. On his side, the fix is teamwork: pair him with a sniper or a support that covers the range he lacks, and never take a solo lane on a wide open map. Full matchup detail lives on the Cosmo counters page.

Key points

• Counter him from outside his orbit with Piper, Brock, Angelo or Tick.
• Bait Planetary Pushback before diving with a tank or assassin.
• Playing him: pair with long range and avoid open solo lanes.

How to Unlock Cosmo and Is He Worth It?

As a Mythic brawler, Cosmo is unlocked through Starr Road progression or by pulling him from Starr Drops, and during his release window he also appears in the launch event track. If you already own the popular Mythic controllers, he is a comfort upgrade rather than a must-have; if your account lacks a proper zone-control brawler, he fills a real gap and is worth the Credits. Is he worth maxing right now? Wait for data. His kit is clearly useful, but his tier will depend on how open the active map pool is, and we do not publish a win rate until the battle sample is large enough to be honest about it. Track his live stats on the Cosmo page and see whether your account already covers his role with our account analysis.

Quick Takeaway

Cosmo is a Mythic Controller who wins by owning the ground the objective sits on. Start with Planetary Pushback and Precession, swap to Telescope Trap against dashes and invisibility, play him in Hot Zone, Gem Grab and Heist, and respect long-range poke. All of this is a launch-window read: no reliable win-rate sample exists yet, so revisit the Cosmo guide, his build and his counters as the meta settles.