The health bar was redesigned, along with a couple of the enemies from the Truck Stop and Hospital. While the score board could be patched back into the finalized version of the game with the use of hacking, the version in the prototype uses 'Activision' as the name of the default high-score holders, as opposed to the final's 'Uncle Bob'.Īrnie's sprite was more pale in the prototype. The inclusion of the attract mode (compromised of a high score board and a pan over the Steel Mill background) allows more of the title theme to be heard than you could in the finalized version. The title screen was colored differently, copyright information was added to and the story cutscene had some changes made to it. Level 5, 'CYBERDYNE', can be selected but can't be played due to a lack of particular data for basic level settings, but mostly because during compilation it didn't fit into the 16K or PRG bank, so it's missing some important parts of the stage data, even if the rest of it is still present in the ROM.Both were never coded and nearly finished, and there is no data and code in this game for these levels except some unused CHR data for sprites of the animated truck, which most probably should be used for Level 6. Levels 4 ('TARGET RANGE') and 6 ('ESCAPE') cannot be selected, as told by the program itself.

Since the proto has no level transition code (except for the second stage), the only way to access any level is a Level Select menu upon pressing Start on the game's title screen. The later European version has the Acclaim copyrights, but the logo and all its graphics completely removed. In the final version, it was released by Acclaim's subsidiary, LJN Ltd. This game was intended to be released by Acclaim Entertainment Ltd., as seen in the copyright screen and a logo displayed during the intro sequence loop.

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