Monsters roam the streets of the city, including you! Fight off sinister creatures while stopping yourself from turning into one too in this deck building card game. Craft a unique deck each round from Day cards, Night cards, and Monster cards. Do you try to stay above board and beat your opponents through clever investigation and tactics, use the seeder underbelly of the city to your advantage, or embrace your burgeoning evil instincts? Or maybe mix a bit of all three! Pick one of six different classic monsters to play as. Unlock new cards and characters as you play, unlocking more and more playstyles and strategies. Themed after 1950's horror comics, build the story of your battle with the cards you play.

In classic deck building fashion, buy cards to use to damage your opponent, protect yourself, or just buy even better cards in the future. Over two hundred cards to play with and unlock.


Take your pick of monsters each with their own cards and strategy. Feed on your foes blood as the Vampire, embrace the night as a the Wraith, make your opponents green with envy as the Plant, crush them with sheer bulk as the Blob, and more!


As you loose health, you become more and more monstrous and the cards you can buy change. Keep your health high to stay in the Day, or intentionally let it slip to gain powerful Monster cards. Just don't let yourself fully lose control to the monster within!


Fangs, Scaly Skin, Mysterious Secretions, take your pick of Afflictions each round to power up your character and find new strategies to win. What's a little inhumanity when it comes with such power?


Use the Blood system to make the game more difficult the more you play it. The harder it is, the faster you'll unlock more content.

The Monster Within is fully playable, with an expansive amount of content already. But it's not quite expansive enough, Since only six of the ten planned monsters are available to play, the game is still in early access. More monsters, more cards, and the fourth and fifth round with dual class monsters and the final boss are all coming soon, free of charge. Just buy the game now and you'll have access to all the upcoming content as it comes out with no additional purchases necessary. So get in there and show the competition why you're the meanest monster around!

The Monster Within is the suped up PG-13 version of TF Card Battle. So if you loved that game for the gameplay, you'll love The Monster Within as well!

2.0::

The game is out of early access and complete! Thanks to everyone who's enjoyed both this and TF Card Battle!

1.2:

New Content:
Added new monster, Werewolf
Added monster new theme pack, Werewolf EX
Added new night theme pack, Light
Added new day theme pack, Darkness
Added new Vampire-Werewolf mashup monster, Werepire
Added new skits for werewolf
Added selection screen for mashup round. (Right now this is only for Vampire choosing to play as Lich or Werepire)

Changes and Bug Fixes:
Lowered initial enemy health slightly
Fixed a bug that made the buy pile cards not snap back to their original positions after being dragged around.
Fixed a bug that allowed to select the affliction you picked round 1 again later
Break Character now draw 3 cards on it's flipped face. (This is technically a bug fix since it always was supposed to do this).
Added an icon on health bar to show how far below 0 health you can survive (this is important for this update since Werewolf loves raising his minimum health)

1.1:

New Content:
Added round four, the monster mash-up round
Added the Lich mash-up monster. Combines the Vampire and the Wraith
Added the Abomination mash-up monster. Combines the Blob and the Mad Scientist
Added the Zombie mash-up monster. Combines the Plant and the Parasite
Added new Day theme pack, News.
Added new Night theme pack, Divination
Added new Monster theme pack, Ruthless
Added Werewolf, Warlock and Shapeshifter monsters as bosses in round 4 (this is because they are an alternate mash-up for some of the playable monsters and you always fight the one you don't use.)

Balance Changes:
Raised starting paper to 50
Lowered enemy health scaling between rounds slightly

1.0.4:

Balance Changes:
Adjusted the cost of Wraith's cards to make his power level more in line with the other monsters.
Dissipate cost reduced from 3 to 2
Incorporeal Form cost reduced from 5 to 4
Shadow Sprint cost reduced from 7 to 6
Phantom Punch cost reduced from 2 to 1
Child of Night cost reduced from 4 to 3

UI Improvements:
Clicking the deck or discard pile again while the viewer window is open now closes the window

Bug Fixes:
Fixed bug in unlock verifier that allowed a desync between monster unlocks triggered and monsters available to play as.
Fixed bug in unlock verifier that caused Topsy-Turvy to re-lock itself.
Fixed the trigger for unlocking Sociopath not working properly
Fixed incorporeal adding a night born to your deck
Fixed some typos and missing images in skits

1.0.3:

Gameplay changes:
Changed how the Pant boss fight works.
Photosynthesis now heals day instead of adding damage = to day.
Plant boss' devour now swallows the player if it does damage. When swallowed Plant always uses the high damage "Chew" and there's a damage in a turn threshold to break out.

Balance changes:
Expanded Range cost increased from 4 to 5.
Police Scanner and Auto-Distress Call now only give 1 attack and shield respectively.
Lowered Wraith boss damage.

UI improvements:
When you view deck contents it's now sorted by card number.

Bug fixes:
Fixed a bug where Down the Hatch increased the potions drunk this turn counter by twice as much.
Fixed some Mad Scientist skits not being triggered.
Fixed a bug where winning as Wraith didn't unlock his EX card pack.
Fixed the Parasite boss going into second stage transformation on any damage taken rather than at a health percentage.
Fixed a bug where the card upgrade screen could show Tech multiple times at once.
Fixed the deck view cards going off the screen.
Fixed the in-game deck viewer and end round deck viewer screens not scrolling properly.

1.0.2:

Balance changes:
Trash to Treasure cost increased from 4 to 5

UI improvements:
Changed the wording of the unlock for the Redundant Organs and Blood Lust afflictions to be more accurate

Bug fixes:
Fixed a few errors with missing images in some skits
Fixed the settings option in the pause menu not working
Fixed a bug that caused the buypiles and hand not to reset on Blood Level 9, round 3
Fixed some typos

1.0.1:

Balance changes:
Vampire's enfeeble now only lowers attack and defense instead of all resources

UI improvements:
Changed Night Borns text to "Remove a RANDOM day card from your deck" for clarification

Bug fixes:
Fixed a glitch that caused the healthbars to have the wrong fill value
Fixed a potential bug that prevented the Occultism set for working for some people. If you're still having issues please report.
Fixed the current set name text in the card upgrade screen not changing
Fixed some typos