You could still technically reach the ending sequence, except that the porting team didn't program that in. The result was oddly asymmetric Jump Physics and 100% Completion being impossible. Jet Set Willy, a port of a ZX Spectrum game, tried to stretch the levels and jumping distance to fit the C64's higher graphical resolution.The incredibly butchered physics engine, the very short draw distance, and the relatively inaccurate drawing scheme and monochrome nature of the 3D engine itself didn't help matters. It moves at a snail's pace in both framerate and actual driving speed and the controls often had you skidding across the road during even the slightest turns. Hard Drivin' wasn't designed for the hardware it was being ported to and is often noted as the worst port of the game in existence.Enduro Racer has graphics that would be acceptable but for choppy and inconsistent scrolling: The player bike and the roadside stripes move at a decent rate, unlike everything else on the road.For proof that racing games can be more gracefully converted from sprite-scaling triple-16-bit-CPU arcade hardware to the relatively puny 8-bit C64, see Power Drift and Buggy Boy.

Cisco Heat features a truly abysmal framerate, ugly and non-transparent sprites for the AI cars, a near-total lack of collision detection, and generic backgrounds that look nothing like San Francisco.There's only one music track, much blockier graphics, jerkier scrolling, sluggish movement, and absolutely no swing physics. The Capcom version is astoundingly half-assed. The Software Creations version is a glorious aversion of this trope, pretty much porting the game as well as the C64 would allow, and sporting a superb remix of the soundtrack by Tim Follin. Bionic Commando had two C64 versions - one by Capcom USA and one by Software Creations UK, both based on the arcade version.

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