Question: Which system by Hero Games is a combination of the Interlock and HERO systems? 

Context paragraphs:
Ninja Hero: Ninja Hero is a martial-arts genre book for the Hero System, published by Hero Games.  There are two distinct editions, one for the Fourth Edition of the rules and one for the Fifth.

Fuzion: Fuzion is a generic role-playing game system created by the collaboration of R. Talsorian Games and Hero Games.  The rights to Fuzion are jointly held by Mike Pondsmith of R. Talsorian Games, along with Steve Peterson and Ray Greer of Hero Games.  "Fuzion" is a combination of the Interlock System, (used in games like "Mekton" and "Cyberpunk 2020"), and the HERO system (used in "Champions", "Justice, Inc.", "Star Hero", etc.).  "Fuzion" is an adaptable system which can be played in any genre and setting imaginable.

Darren Watts: Darren Watts (born February 17, 1969) is one of the founders (along with game designer Steve Long) of DOJ Inc. and the president of Hero Games, publishers of roleplaying games using the Hero System such as Champions, Fantasy Hero and Star Hero.

Guitar Hero Smash Hits: Guitar Hero Smash Hits (titled Guitar Hero Greatest Hits in Europe and Australia) is a music rhythm game and the fourth expansion game to the "Guitar Hero" series.  The game features 48 songs originally featured in five previous games in the series—"Guitar Hero", "Guitar Hero II", "", "" and ""—redesigning the songs to be based on master recordings and to include support for full band play first introduced to the series in "Guitar Hero World Tour".  The game was developed by Beenox, published by Activision and distributed by RedOctane for release on the PlayStation 2, PlayStation 3, Wii, and Xbox 360 systems and was released around the world in the second half of June 2009.

Fantasy Hero: Fantasy Hero is a role-playing game book that supports the Fantasy genre using the Hero System rules.  Since the release of the 5th edition of the Hero System, Steven S. Long of Hero Games has published a new version of the Fantasy Hero book, as well as several supplementary publications to support Fantasy Hero-based campaigns.  The Hero system book is required to make full use of this work in a game.  The book contains information that is useful to both the Game Master (GM) and the Players. Recently, a new edition of Fantasy Hero has been released, updating the genre book to the new Hero System 6th Edition.

Star Hero: Star Hero is a role-playing game, published by Hero Games, which uses its Fifth Edition "Hero System" rules to represent the science fiction genre.  Though not nearly as popular as its "Champions", "Dark Champions", and "Fantasy Hero" lines, the genre book has been received well by fans and critics alike, and its "Terran Empire" setting has received positive reviews.

PS238: PS238 is a comic book that follows the lives of both teachers and students at an elementary school for children with super powers, which the comic calls metaprodigies.  Issue #0 was published in November 2002.  PS238 is written and drawn by Aaron Williams and published by Do Gooder Press.  Until issue #20 it was published by Dork Storm Press and Henchman Publishing.  In December 2006 Aaron Williams started posting the comic page by page on his website.  The online version was updated Monday, Wednesday and Friday.  Hero Games created a PS238 role-playing game using their "Champions" game system.

Dark Champions: Dark Champions is a game published by Hero Games using its Hero System rules to simulate the action-adventure genre.  It has not been adapted for the 6th edition HERO rules introduced in 2009.

List of songs in Guitar Hero World Tour: "Guitar Hero World Tour" is the fourth major release in the "Guitar Hero" series of music video games, a series that has sold over 24 million units and earned more than $1.6 billion in retail sales.  The game was released in October 2008 for the PlayStation 2, PlayStation 3, Wii, and Xbox 360 game consoles in North America, and a month later for PAL regions.  It was released in Europe and on a limited basis in North America for the Microsoft Windows and Apple Macintosh platforms.  The game was developed by Neversoft, with assistance from Vicarious Visions and Budcat Creations for the Wii and PlayStation 2 versions, respectively, and distributed by RedOctane and Activision.  "Guitar Hero World Tour", like the other games in the "Guitar Hero" series, focuses on the use of special game controllers to mimic musical tracks from popular rock songs that date from the 1960s to contemporary hits.  While previous versions of the series have only used a guitar-based controller for lead and bass guitar tracks, "World Tour" adds in drums and vocals, allowing up to four players to create a virtual band.  For each instrument, the player scores points by matching controller actions with note gems on the game screen to avoid a bad performance that may end the song prematurely.  In addition to the on-disk songs, the PlayStation 3, Xbox 360, and Wii versions support the ability to obtain new songs through downloadable content.  A new music creation system also allows users on the same systems to gain new user-created songs through the game's "GHTunes" service.

Hero Games: Hero Games ("DOJ, Inc dba Hero Games") is the publisher of the Hero System, a generic roleplaying rules set that can be used to simulate many different genres, and was the co-developer of the "Fuzion" system.

Supporting paragraphs: Hero Games Fuzion
Answer: Fuzion