The first Activision games for Intellivision that I recall seeing were Pitfall and Stampede, which were rather pedestrian ports of their popular Atari VCS (later the 2600) counterparts. In my opinion, those games illustrated the wrong way to do Intellivision ports. The graphics and sound were not appreciably different than the Atari VCS games, and due to their design for a joystick controller, gameplay was more difficult than it should have been. To me, they seem like projects to learn to program the Intellivision, since later Activision titles were clearly much better. Of course, it helped when a few Mattel folks defected to Activision, too. :)

I guess, looking at history, Activision won the day over all those third-party game companies. Based on the general quality of their Atari VCS and Intellivision games, I'd say they're deserving of their success.

Title		Item No.	Manual	Overlays	Rarity	Notes
	Beamrider	M-005	Yes	2	R2	Game review / info
	Happy Trails	M-003	Yes	2	U1	Rebate sticker on box (didn't they all have that?); price tag tear; game review / info
	Pitfall!	M-002	Yes	2	C1	Includes flyer for Pitfall and Stampede - M-9405; game review / info
	River Raid	M-007	Yes	2	ER2	Game review / info
	Stampede	M-001	Yes	2	C1	Includes flyer for Pitfall and Stampede - M-9405; game review / info
	The Dreadnaught Factor	M-004	Yes	2	U2	Includes catalog; have Dreadnaught Destroyer patch; game review / info
	Worm Whomper	M-006	Yes	2	R2	Not compatible with ECS; game review / info