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Advertisement: is a MMO game made by Federico Mouse on November 9, 2016. It is an Endless Game where you start off as one out of 4 tiny fish (or an aquatic worm, if that's what you would rather be) and starting consuming food, while trying to avoid getting eaten by the other players. Once you have eaten enough, you'll be able to evolve into a stronger animal, and you can do so up to 9 times, with multiple choices available at each tier.

While the game is centered around the watery environments, including the titular deeeep, not all of the animals are fish or fully aquatic. You can also choose watergoing land-dwellers like frogs or beavers, or even the aquatic birds like Ducks and Pelicans. Each is fitted to survive in either one or two specific biomes, or at most several different ones: none are able to comfortably survive in all biomes, and some will outright die if you evolve into them while being in a wrong location.


Thus, there's the Ocean itself, where players start off in, the Ocean Deeeep, Ocean surface for the air breathers, the Arctic + Arctic surface and swamp + swamp surface. Being in a wrong area will immediately weigh on one of the relevant meters: fish that are literally out of water will start losing oxygen, but so will birds and beavers when they dive underwater. Creatures not suited for the Arctic will see their temperature gauge go down; this also happens to Arctic dwellers leaving their area, as they slowly overheat. Arctic or Oceanic water dwellers going into the swamp experience salinity loss, and swamp swimmers likewise find ocean water too salty. Lastly, any dweller of the deeep swimming upwards elsewhere will soon suffer from the pressure drop; equally, every other creature feels overpressured if it ever ventures down there.


See for a top-down spiritual predecessor to this game, and for a bird-centered equivalent to this. contains examples of...

  • Abnormal Ammo: Polar bears can shoot snowballs at other animals, and Goblin sharks shoots a jaw at the target.
  • Alluring Anglerfish: One of the Tier 7 choices. Just standing still causes their body to become invisible, while their lure suddenly resembles a generic piece of food any player has eaten by the hundreds to get anywhere.
  • Armor-Piercing Attack: Shelled animals possess Armor values - i.e. Crabs and Sea Turtles have 50% Armor, while Tier 10 Sunfish has 60%. Hence, some animals also possess Armor Penetration. For squids, it's 50% (normal) or 75% (giant); Narwhals and Marlins completely ignore it due to their powerful "tusks".
  • Artistic License – Biology: When compared to and, is by far the most realistic of the three; it doesn't feature any dragons or star-eating space creatures, for one thing. Literally any animal in it actually exists in real life, no matter if it's Blobfish, Icefish, Barreleye or Mahi-mahi. Nevertheless, there are some notable ways where even abstract biological facts take a back seat to Rule of Fun.
    • The game allows all Tier 9 and 10 animals to attack and kill human swimmers and get experience points for it. This obviously makes sense for great white sharks, hammerhead sharks or even giant squid, and while whales/dolphins/orcas intentionally killing humans for score points is a stretch, one can let it slide. However, other examples include marlins and oarfish, or even seals, bald eagles and Manatees, which are slow and far better known for being hunted then even theoretically harming humans. At least the stonefish and sunfish were excluded due to the ridiculousness of them bringing down a human, but it only raises the question why the other animals no more likely to kill one retain this power.
    • Dragonfish sound cool, so the game gives them the ability to slow down prey by emitting red glare, which is cool, but obviously has nothing to do with reality. In Real Life, dragonfish do have powers that can be gamified; they are able to near-instantly bury themselves in the ocean floor, and they can also spray foul substances like some marine skunks. However, such defensive abilities would require placing it somewhere below Tier 8, where the majority of in-game creatures have long become prey. (Moreover, snapping turtle can already hide like this, but also produces bait food drop near its hiding spot.)
  • Bears Are Bad News: Polar Bears are Tier 10. While their stats are pretty standard for the top tier, the ability to throw stunning snowballs makes them the main nemesis of the Blue Whale (since the latter is largely reliant on sucking in water in a vortex to do damage, which will draw in the snowball and leave them defenceless.)
  • Beast Master: Whale sharks can summon remora fish, which will follow them and fight for them.
  • Bird-Poop Gag: Playing as a Seagull will cause you to spawn Bird Poop every 10 seconds of in-game time. Moreover, low-tier aquatic creatures can then eat it.
  • Combat Medic: Oarfish cannot attack Tier 1 to 5 animals, and will heal them instead. Those of higher tiers are fair game. Oh, and they can attack, and kill, human swimmers too, somehow.
    • Manatees will also heal other animals around them. They also retain the ability to kill and eat human swimmers, which is one of the least realistic parts of the game.
  • Doppelgänger Attack: Tier 9 Humboldt squid can create up to 2 clones of themselves once they eat enough.
  • Disability Superpower: A real biological example: Tier 1 Blind Cavefish only see within a very narrow radius, but they detect bodily vibrations within a much greater range.
  • Enemy-Detecting Radar: See Disability Superpower above for Blind Cavefish.
    • Sharks can also smell blood, though this is more of a prey-detecting radar. (Though, since bleeding only occurs on the creatures struck by the Marlins and Polar Bears - both fellow Tier 10s - it also lets you know one of your strongest rivals is in town.)
    • Bald Eagles will have icons for the offscreen animals show up, to represent just how good their eyesight is. Those icons will even appear faint for the distant animals and large and opaque for ones just-offscreen.
  • Evolutionary Levels: Here, there are 10 tiers of the evolutionary ladder, which also diverge and spread out multiple times, so that the total number of animals is 43.
  • Fragile Speedster: With "only" 700 HP, Marlins are the most fragile Tier 10 animal, as most other top-tier animals have 900, with sperm whale at 1200 and blue whale at 1500; Sunfish and Stonefish may also have 700 HP, but their armor absorbs at least half the damage, often effectively doubling their health. However, Marlin is both 20% faster than any other creature of its tier, and has 100% Armor Penetration due to its tusk.
  • Friendly Fireproof: The game's definition of "friendly fire" is any player-controlled animal attacking any other player-controlled animal. It's safe to say that it is turned on by default for the vast majority of cases, and most of the exceptions are to do with the top tiers being completely immune to anything the bottom tier does: a clownfish obviously has no chance of even breaching the skin of a whale.
    • However, tiers 10 usually cannot damage tier 1 either, since they are too small for them. An exception is if tier 10 is a swarm of piranhas.
    • There are straightforward examples, though: giant isopods cannot damage each other, and neither can snakes, Narwhals, Humboldt Squids, etc.
  • Friendly, Playful Dolphin: Averted. Tier 9 and 10 animals are the only ones who get to eat human swimmers. Dolphins are Tier 9.
  • Giant Squid: A Tier 10 animal, most notable for its grapple move (see below), and 75% Armor Penetration.
  • Grapple Move: Tier 6 Pelicans can "grab" anything from Tier 1 to tier 4 inside their pouch, where they'll continue to receive damage. It is possible to outlast this grab, but it is still very difficult, and the Pelican can just drop its aquatic on some island afterwards, and repeat.
    • Tier 7 Snakes can wrap themselves around other creatures, and will automatically poison them. However, this approach mainly works on land, since they cannot breathe underwater, and so won't usually be able to stay attached until their target's death.
    • At Tier 10, Orcas, Crocodiles, Giant Squids and Anacondas possess one. Orcas' move is extremely effective against fellow tier 10 great white Sharks, which are instantly deprived of all oxygen through this move, and so will receive both normal damage and suffocation one until they break free. On the contrary, Giant Squid's grab is rebuffed by the Cachalot, and even trying it will only cost you health. Crocodiles' grab deals more damage if you also shake around in different directions while doing so. Anacondas can only constrict their targets from the back.
  • Master of Disguise: Basic, Tier 4 Squid become invisible if they stand still. Octopi outright assume the appearance of the last animal they have killed.
  • Never Smile at a Crocodile: One of the Tier 10 choices. Its health and damage output are both lower than the Tier 10 average, but this is compensated for by its grab attack, 30% armor afforded by its scales, and limited armor piercing capability.
  • Non-Indicative Name: The so-called King Crab actually has exactly the same stats as a normal crab, but while the latter can safely venture out to the surface, the King is limited to the deeeep. Its real advantage lies in its spikes, which will automatically damage any attacker.
  • No-Sell: A Giant Squid trying to grab a Cachalot (sperm whale) will instead be rebuffed, and lose 5% of its health alongside it.
    • Sunfish, Oarfish and Sea Turtles are completely immune to poison.
  • Oxygen Meter: Present for nearly all animals. Given the game's theme, it'll start draining on the surface for the majority of playable animals, with air-breathers like seagulls being the exceptions. Crabs feel fine both underwater and on the surface.
    • King crabs also don't suffer for oxygen above water, but the overly low pressure compared to the deeeep they are used to will still get them.
    • (Blue) whales have the ability to suck in water and any nearby creatures that are not too large with it. If they are below tier 6, they cannot be damaged, and will instead simply travel inside the whale until it surfaces and spits them out. However, seabirds will eventually suffocate inside the whale.
  • Piranha Problem: Piranhas are strongest Tier 1 creature, but that's nothing. What makes them really unique is the ability to stick with it through the entire game, opting to simply add on another piranha every time, instead of evolving into a higher-tier animal.
  • Psycho Electric Eel: Downplayed; they are a Tier 6 animal, and their electricity works well...but it is mainly a defensive measure, since the electricity cannot be projected outside their body.
  • Regenerating Health: Present by default, unless you are suffering from not being in your element. Icefish has a key advantage over the other Tier 1 options due to regenerating health 3x faster when it is completely still.
    • Manatees can instantly heal themselves for 400 HP.
  • Rising Up The Food Chain Game: Subverted. Unlike both and, where the player-controlled animals of lower tiers are nearly always strictly prevented from harming those of the upper tiers, while upper tiers can prey on nearly anything below it (leading to hedgehogs chasing deer and hornets stalking bats), here, any animal can harm nearly any other animal (with several exceptions for each: see Friendly Fireproof below), and will get XP through Meat drops if they succeed. Thus, there's no Ultimate Life Form like's Black Dragon or Fly Or Die's Grim Reaper either; just twenty two Tier 10 animals instead, to punctuate that while gaining tiers is obviously beneficial as it still raises stats, the focus is on the ecosystem and how your playstyle fits into it.
  • Shout-Out: You can find an "Abandoned House" on the map, which looks exactly like the pineapple a certain sponge lived in, now missing its top and in obvious disarray.
  • Sonic Stunner: The special ability of the tier 10 Cachalot (better known in English as a sperm whale, and a notable predator.) It doesn't completely stun its targets, but a 35% speed reduction is still nothing to sneeze at.
  • Smoke Out: Octopi can do a similar trick with their clouds of ink.
  • Spell My Name with an "S": The titular deeeep. There's even a small note near the corner of the main page, clarifying "with four e's". Equally, the depths of both the ocean and the swamp are to be described as ocean deeeep and swamp deeeep.
  • The Spiny: Pufferfish are an archetypal example once they inflate: everything approaching them will take damage, be knocked back, and also get poisoned.
    • Electric Eels are this when they electrify themselves.
    • Tier 2 King Crabs are covered in small spikes and will automatically damage anyone trying to attack them.
  • Status Buff: Tier 9 Manta Rays have Auras that buff smaller animals travelling near them; notably, the exact nature of a buff is different for each animal.
  • Tree Cover: There are islands in the game, and they'll often have trees. Seagulls can literally hide in the canopy, and so can snakes (which is entirely possible in real life.)
    • In a broader sense, several other, mostly underwater objects can also be used as static cover. Tree Beavers and Ducks can hide in beaver dams. and all but the Tier 10 animals can hide inside the Shipwreck and the Abandoned House.
  • Ultimate Life Form: Averted. The evolutionary tree of the game only broadens, and there are twenty two animals in the Tier 10; more than in Tier 1, 2, 3 and 4 combined. This is so that the players who endure through the entire game would always have something to best fit their playstyle. Thus, while Tier 10 obviously includes the cool, massive creatures like whales, giant squid, and great white sharks, it also features rather less iconic Marlins for the players who really like fighting with tusks, and the small, yet armored stonefish and sunfish. (The latter is a defence-focused Stone Wall with complete immunity to poison; the former is more of a Mighty Glacier, as it does substantially more damage while retaining respectable defence.) Notably, Piranha enthusiasts can just ascend to that ultimate stage with a swarm of 10 piranhas.
  • Zerg Rush: The tactics of the piranha players. Piranha is a Tier 1 fish that has the largest health at 300 (vs. 150 for the default Clownfish and Cavefish, 100 Worm and 200 for Icefish, Blobfish or even Tier 2 Crabs) and largest damage at 30, vs. 10-20 of the other options. Afterwards, you can evolve into first the parasitic lamprey, and then the other animals of corresponding tiers...or you can choose to keep adding on an extra piranha per tier, until you become a fearsome swarm of 10, a threat to even the whales and a force easily capable of devouring humans.


Example of: