Is Mr. Do!'s Castle on Steam?

No. Mr. Do!'s Castle is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

When did Mr. Do!'s Castle release?

Mr. Do!'s Castle was first released on December 31, 1983.

Mr. Do!'s Castle

Dec 31, 1983PlatformArcadeColecoVisionArcadeAtari 2600Atari 8-bitCommodore C64/128/MAX

Mr. Do!'s Castle — frequently asked questions

Is Mr. Do!'s Castle on Steam?: No. Mr. Do!'s Castle is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Mr. Do!'s Castle on?: Mr. Do!'s Castle is available on ColecoVision, Arcade, Atari 2600, Atari 8-bit, Commodore C64/128/MAX, Atari 5200, MSX, Commodore 64.
When did Mr. Do!'s Castle release?: Mr. Do!'s Castle was first released on December 31, 1983.

About Mr. Do!'s Castle

Mr. Do!, that king of arcade clowns, is in a bit of a bind - again! This time, a pack of pesky unicorns is trampling the bricked hallways of his castle. Help Mr. Do! rid his dwelling of these crafty, quick-changing (and deadly) creatures with the skillful swing of a hammer. Sometimes a quick clobber to the head will do it. Or maybe a well chosen brick knocked out from above. If you can't stop these critters, then break a hole in the floor to slow 'em down. It's up to you to know when to fight - or when to flee! Tension mounts as you hurry Mr. Do! through the castle's maze, grabbing keys along the way. Only when Mr. Do! has collected all the keys can he unlock the castle door, and open up an extra chance to beat these nasty critters!

Summary via IGDB.

Mr. Do!'s Castle on Wikipedia

Mr. Do's Castle, released in Japan as Mr. Do! vs. Unicorns, is a 1983 platform video game developed and published by Universal for arcades. Marketed as a sequel to the original Mr. Do! released one year earlier, the game bears a far closer resemblance to Universal's Space Panic from 1980. It began as a game called Knights vs. Unicorns, but the U.S. division of Universal persuaded the Japanese arm to modify the graphics into a Mr. Do! game following the first game's popularity.

Source: Wikipedia (text under CC BY-SA 4.0).

Game details

Platforms: ColecoVision, Arcade, Atari 2600, Atari 8-bit, Commodore C64/128/MAX, Atari 5200, MSX, Commodore 64
Developer: Universal Co., Ltd.
Publisher: Parker Brothers
Game modes: Single player
Themes: Action

Details via IGDB.

Reception

IGDB rating

60/100

from 10 ratings

Every version compared

Prices, contemporary reception and the studio credited for each release

Platform	Year	Loose	Complete	Sealed	Built by
Atari 2600	1984	$69	$769	—	Parker Bros.

Also released on: ColecoVision · Arcade · Atari 8-bit · Commodore C64/128/MAX · Atari 5200 · MSX · Commodore 64. We haven’t priced or authenticated those versions yet.

Collector value & authenticity

Atari 2600 · PriceCharting sold data · Verified 2026-10-06

Loose

$69

Complete

$769

Sealed

—

Release record

Territory	Label	Catalog #	Rarity
North America Parker Brothers	Standard	PB5820	Very Rare+

Source: Catalog numbers, label types, rarity, controllers and player counts: AtariAge 2600 software database

Region: NA
Released: 1984
Controller: Atari Joystick
Players: 1
Authenticity: Med

Not in Atari 50 — other compilations and plug-and-plays are not tracked hereMedium counterfeit risk

Atari 2600 prices, all games & how to spot a fake

A late Parker Brothers arcade port, where a boxed copy is the real purchase.

Mr. Do's Castle is a 1983 Universal arcade game, marketed as a sequel to Mr. Do! though it plays closer to Universal's Space Panic. It began as a game called Knights vs. Unicorns. Parker Brothers published the 2600 version in December 1984, along with the Commodore and ColecoVision ports. The cartridge arrived late in the 2600's commercial life.

Cartridge & preservation record

Program size 8 KB, measured from the preserved dump.

Catalogue number as recorded for the physical release.

Also on other platforms

Arcade · Atari 5200 · Atari 8-bit · MSX · ColecoVision · Commodore 64

Atari 2600	Parker Bros.
Arcade	Universal
ColecoVision	Parker Brothers (publisher)
Commodore 64	Parker Brothers (publisher)

Before you buy

Medium risk. No fakes are documented. The box and manual carry much of a complete copy's value, so check that both are present and original. Compare the Parker Brothers label against AtariAge's scans and ask for a board photo through the dust door.