Calvin and Hobbes: Invasion!

Calvin and Hobbes: Invasion! is a Calvin and Hobbes video game released by Traveler's Tales for PC, Nintendo, and Nintendo Switch. It was designed by Bill Waterson for his adopted daughter, Kamala Waterson, who sold it to Traveler’s Tales. The game allows up to three players and you can switch to other characters, who follow you around when not being controlled.

Plot
Intrigued by Earth thanks to his collection of snowglobes from it, the Moon Emperor, ruler of the Moon Goons, a race of aliens who live on the moon, orders an invasion of Earth. His ambiguously evil head scientist, Dr. Creeper, reluctantly gives him the Imaginator, which can bring anyone's imagination to life. Rosalyn, who works for the Moon Goons, uses the Imaginator on Calvin, causing the characters and places from his imagination to come to life. The Moon Emperor captures Spaceman Spiff, Stupendous Man, Tracer Bullet, and the Calvinosaur, and the Moon Goons, assisted by the monsters and villains from Calvin's imagination, take over the world.

Calvin and Hobbes set out to stop them and go through their hometown, Forest Hills, battling Moon Goons and the various monsters who lived under Calvin's bed. They eventually go to Calvin's school and defeat Rosalyn, who is rescued by Dr. Creeper. The duo frees Susie, who joins them, giving Calvin a mirror in gratitude. They decide to save Calvin's alter egos to help them bring down the Moon Emperor.

They go to the Kongo Wrongo, a jungle from Calvin's imagination, to save Tracer. Rosalyn stirs up the natives against them, and aided by Moon Goons and the jungle's monkeys, the Natives go after Calvin, Hobbes, and Susie. The trio is undeterred and are able to enter the temple of King Kongo, a giant ape worshiped as a god by the natives. They fight King Kongo, defeat him, save Tracer, and convince the natives of the Moon Goons' evil. The natives chase away the Moon Goons and imaginary creatures. The group, now including Tracer, leaves.

They are teleported to the Game of Death, a dimension like a giant board game with elements of chess, Monopoly, Battleship, Candy Land, and checkers. It turns out to be inhabited by "Gamemen" who are ruled by Ghost Calvin, the ghost of Calvin's Good Side who has turned evil. The Game of Death is also under attack by Moon Goons and Monkeys. The foursome fight their way to Candy Castle, Ghost Calvin's ruling seat, and after a battle with Ghost Calvin, they defeat him and Calvin accepts that he can't split himself of the qualities he doesn't like, merging with Ghost Calvin.

The Moon Emperor orders Dr. Creeper to build a death ray in order to destroy Calvin, Hobbes, and their friends. Dr. Creeper sets up a laboratory in a Moon Goon base inside of a volcano. The volcano is guarded by Moon Goons, Monkeys, and Lava Golems, and Rosalyn supervises (and constantly harangues) Dr. Creeper. Calvin, Hobbes, Susie, and Tracer head to the volcano to save Stupendous Man, who is being held prisoner there. They fight their way up to the lab in the volcano's crater and Rosalyn forces Dr. Creeper to fight them in a floating platform armed with various weapons. They defeat him, free Stupendous Man, and flee the volcano, which erupts. Rosalyn abandons Dr. Creeper, who is seemingly killed by the lava. The Moon Emperor sends Rosalyn back in time to guard another of Calvin's "associates".

Calvin, Hobbes, and their friends head to the polar "Sordid Snows" to rescue Spaceman Spiff, encountering deformed, living Snowmen, Monkeys, and Moon Goons along the way. Eventually, they reach a frozen lake where the Snow King, the ruler of the Sordid Snows, is keeping Spiff. They fight the Snow King and a massive Snow Snake, defeating the former and freeing Spiff. Spiff uses his ship's warp drive to bring King Kongo to the Sordid Snows, and he melts it and its snow-made inhabitants using his fireballs while the group escapes in Spiff's ship.

They return to Forest Hills and use the Time Machine to go to Jurassic Fantastic, a place in the Jurassic Era where the Calvinosaurus is being held captive. They fight their way through Moon Goons, Monkeys, and Velociraptors, eventually going up against Rosalyn riding a brainwashed Mosasaur. They defeat the Mosasaur, freeing the Calvinosaurus, and Rosalyn flees to the present.

The group, now complete, heads to the Moon and enter the Moon Empire, the Moon Goons' capital city. They fight armies of Moon Goons and imaginary creatures, eventually going up against Rosalyn, who is riding a hoverboard. After being defeated, Rosalyn tries to escape on the hoverboard, but Susie brings it down with a lacrosse ball, causing it to explode and presumably kill Rosalyn. Then they fight the Moon Emperor in a tower and he uses both laser weapons, explosives, and the Imaginator against them, but is still defeated. He attempts to kill Calvin and Hobbes with the Imaginator, but Calvin uses Susie's mirror to deflect the bolt, causing the Moon Emperor to get trapped in a snowglobe.

Hobbes hits the reverse button on the Imaginator and fires it at Earth, causing all the imaginary creatures and places there to get erased from existence. He then rips the Imaginator out of its power generator, causing it to short-circuit and explode. The tower starts collapsing, but Dr. Creeper arrives and saves them. On Earth, Calvin's parents tell Calvin that the Moon Goons have been driven back. The alter egos give the snowglobe containing the Moon Emperor to a little girl, who repeatedly shakes it.

Gameplay
The game is a platformer. You explore the various Worlds and collect items like Frogs and Comic Books while fighting Enemies like aliens and snowmen. You start out controlling Calvin and Hobbes and unlock new characters along the way. You can customize the characters using Costumes.

Attributes
You have 4 different Attributes: Attack (different attacks listed below), Speed (how fast you are), Agility (jumping over crevasses and wall-jumping), and Intellect (solving puzzles and bartering with Ronald and other players). You gain points from Attributes by completing tasks that require their usage. Once you get enough attribute points, you learn new skills under that Attribute.

Attacks
You start with Punches (self-explanatory) and Filler Attacks (a flurry of punches that enable you to fill the bar for your Special Move) but then learn Jumpkicks (also self-explanatory), Slam Attacks (jumping into the air and causing a powerful shockwave by landing), and Pounce Attacks (pouncing on your enemy and knocking him to the ground). You can also use weapons, and obtain power-ups from the Cardboard Box. You have a certain amount of Health that will drain when you are hit by an enemy and when you run out of Health, you die.

Gymnasium
The gymnasium of Forest Hills' school can be used for PvP tournaments. It is advisable to give your characters Costumes while entering the Gymnasium so as to tell the difference between other characters.

Items
There are many items found in-game.


 * Frogs: The most important item in the game. They can be bought from Ronald using Comic Books or found hopping around the Worlds. The latter type can be stunned using an Attack and then collected. All the Frogs in a World must be collected before you can go to another World.
 * Comic Books: The main currency of the game. They can be found floating around at every location and used to pay for traveling between Worlds and buying Frogs, Weapons, Vehicles, and Costumes from Ronald.
 * Weapons: Can be bought from Ronald. They are used to fight enemies in the place of Attacks. List of Weapons: Rubber Mallet, Squirt Gun, Dart Gun, Switchblade, Invisible Creteniser, Baseball Bat, Wrench.
 * Tuna: Can be used to replenish lost Health.


 * Cardboard Box: It will sometimes spawn in locations to give power-ups. The Transmogrifier can turn you into a randomized animal with an Attack boost, the Duplicator creates a few temporary Duplicates of you who will help you for 60 seconds before spectralising, and the Cerebral Enhance-O-Tron gives you a temporary Intellect boost.


 * Vehicles: Used to travel between Worlds and for transport and extra speed. They must be bought with Comic Books. None of them can go to Jurassic Fantastic except the Time Machine. List of Vehicles: Skateboard (with buckeyes for ammo), Wagon (with water balloons for ammo), Toboggan (with snowballs for ammo), The Saucer (with lasers for ammo), and the Time Machine (with hatching dinosaur eggs for ammo).
 * Costumes: Used to customize your characters. List of costumes: Halloween Costume, Space Costume, Hula Costume, Christmas Costume, Skunk Costume, Spy Costume, Arctic Costume, Superhero Costume, Uncle Sam Costume, Beach Costume, Safari Costume, Wizard Costume, Office Costume, Invisible Pink Unicorn Costume, Actor Costume, Clown Costume, Scientist Costume, Knight Costume, Dragon Costume, and U.S. Army Costume.

Characters
There are many different characters in the game.

Heroes

 * Calvin: Attack: 4/5. Speed: 5/5. Agility: 3/5. Intellect: 3/5. Special Move: Indian Arrow Swarm.
 * Hobbes: Attack: 4/5. Speed: 3/5. Agility: 5/5.  Intellect: 4/5. Special Move: Power Pounce.
 * Susie: Attack: 3/5. Speed: 3/5. Agility: 4/5. Intellect: 5/5. Special Move: Lacrosse Ball Launch.
 * Spaceman Spiff: Attack: 3/5. Speed: 2/5. Agility: 2/5. Intellect: 3/5. Special Move: Zorcher Zap.
 * Stupendous Man: Attack: 5/5. Speed: 4/5. Agility: 4/5. Intellect: 2/5. Special Move: Crimson Meteor.
 * Tracer Bullet: Attack: 2/5. Speed: 3/5. Agility: 3/5. Intellect: 5/5. Special Move: Smokin’ Slugs.
 * Calvinosaur: Attack: 5/5. Speed: 4/5. Agility: 2/5. Intellect: 1/5. Special Move: Rapacious Roar.

Enemies

 * Moon Goons: Grey-skinned, bug-like moon aliens who shoot lasers at you. Appear in all Worlds.
 * Monsters: Cecaelia-like slimy creatures who attack with their tentacles and claws. Appear in Forest Hills, and the Moon Empire.
 * Monkeys: Attack with banana boomerangs. Appear in the Kongo Wrongo, The Game of Death, Dr. Creeper’s Volcano Lair, the Sordid Snows (wearing eskimo garb), Jurassic Fantastic, and the Moon Empire.
 * Natives: Natives of the Kongo Wrongo who wear shrunken heads and clothes made from grass, skins, etc. Stab you with spears. Appear in the Congo Wrongo.
 * Gamemen: Some look like huge Monopoly pieces with arms and legs, some are chess pieces, and some are giant checkers pieces. They try to “take” you by body-slamming you. Appear in the Game of Death and the Moon Empire.
 * Lava Golems: Hulking lava monsters that spit lava balls at you. Appear in Dr. Creeper’s Volcano Lair and the Moon Empire.
 * Snowmen: Deformed snowmen who try to hit you with their arm branches. Appear in the Sordid Snows and the Moon Empire.
 * Velociraptors: Small feathered dinosaurs who try to bite you. Appear in Jurassic Fantastic and the Moon Empire.