What platforms is Onslaught on?

Onslaught was released on Sega Mega Drive/Genesis, Atari ST/STE, DOS, Amiga.

When did Onslaught release?

Onslaught was first released on December 31, 1989.

Onslaught

Dec 31, 1989FightingPlatformArcadeSega Mega Drive/GenesisAtari ST/STEDOSAmiga

Onslaught — frequently asked questions

What platforms is Onslaught on?: Onslaught was released on Sega Mega Drive/Genesis, Atari ST/STE, DOS, Amiga.
When did Onslaught release?: Onslaught was first released on December 31, 1989.

About Onslaught

Onslaught is an action platformer originally released for the Amiga and ported to the Atari ST, Genesis, and XBL Community Games.

Summary via IGDB.

Game details

Developer: Realms
Publisher: Ballistic
Game modes: Single player
Themes: Action, Fantasy, Historical

Details via IGDB.

Reception

IGDB rating

60/100

from 1 ratings

Every version compared

Prices, contemporary reception and the studio credited for each release

Platform	Year	Loose	Complete	Sealed	Fake risk
Sega Genesis	1991	$30	$134	$201	Low

Also released on: Sega Mega Drive/Genesis · Atari ST/STE · DOS · Amiga. We haven’t priced or authenticated those versions yet.

Collector value & authenticity

Sega Genesis · PriceCharting sold data · Verified 2026-10-29

Loose

$30

Complete

$134

Sealed

$201

few sales

How often it sells

Loose: about once a month
Complete: about once a month
Sealed: about once a year

Prices marked “few sales” rest on about one recorded sale a year, so treat them as a rough guide: the next copy could sell well above or below. Expect to wait for one to come up.

Sales frequency from PriceCharting's completed-sale records, as of 2026-10-29.

Price over time

Loose
Complete

A loose copy sold for about $0.99 in Jul 2008, $36 five years ago, and $30 as of Oct 2026.

Show as table

Month	Loose	Complete
Jan 2009	$0.99	—
Jan 2010	$4.99	—
Jan 2011	$16.99	—
Jan 2012	$10.71	—
Jan 2013	$9.49	—
Jan 2014	$15.07	$19.99
Jan 2015	$28	$35
Jan 2016	$19.94	$30
Jan 2017	$14.99	$70
Jan 2018	$14.14	$44
Jan 2019	$19.99	$48
Jan 2020	$29	$58
Jan 2021	$23	$54
Jan 2022	$48	$100
Jan 2023	$68	$100
Jan 2024	$35	$105
Jan 2025	$28	$127
Jan 2026	$17.16	$116
Oct 2026	$30	$134

Monthly price estimates from PriceCharting's completed-sale records, sampled quarterly, through Oct 2026.

Release record

Territory	Date	Barcode
North America	July 1991	015605031076

Source: Product numbers: MAME's Mega Drive software list and the No-Intro serial records in the libretro database, published where both agree on the same cartridge dump, or from the libretro records alone where MAME lists no number for that dump. Board and ROM numbers: MAME's software list

Region: NA
Released: 1991
Authenticity: Low

Modern re-releases, such as Sega Ages, the Genesis Mini and Nintendo Switch Online, are not tracked hereLow counterfeit risk

Sega Genesis prices, all games & how to spot a fake

An unlicensed 1991 cart that sits just above the middle of the unlicensed pack.

Onslaught was made by The Code Monkeys and published by Ballistic in North America in July 1991. This is an unlicensed cart, made without Sega's licence.

Before you buy

Among the unlicensed carts of the 1990s, the loose cart sits slightly above the middle. Check that the cart is complete if you want the box and manual too.