Amstrad - Detail level is pretty high for most of the game, not as high as the Spectrum version but this is more down to the fact that the CPC version is in colour, The main sprite is quite blocky, and looks to me to have a uni-brow, different colours are used in many of the enemies to give the illusion of shading which helps to keep the Amstrad version looking impressive, all the enemies have a certain charm to their designs.

Spectrum - Easily the most detailed of the three, a lot of the code seems to be shared with the Amstrad version, but due to this being in monochrome more room is given for extra detail, all the bosses look fantastic.

C64 - The basic level of detail is quite high, but many sacrifices seem to be made with the enemy sprites which now have none of the personality they once had, many of the enemies now look like walking blobs (I actually mean that literally, what were furry yeti things in the second level are now round blobs that walk instead) and the excellently drawn pteradactyls now look like badly drawn bats. All the bosses are now pale shadows of what they once were, not only that but the second stage boss is now a block that tries to crush you instead of the Jack Frost looking guy.

Amstrad - A little inconsistent, some of the levels look excellent in colour and some not so much. The colours used are occasionally over the top but are always well within the realms of the cartoony platformer genre, nice blending of colours in the sprites to give everything a more rounded look. Pretty good all said and done.

Spectrum - Most of the levels are monochrome, or at best only two colours.

C64 - The C64 version doesn't go overboard with the colours, and as such I feel comes off the better, it has a more understated design, which is nice, but doesn't have anywhere near the kind of coloured shading of the CPC version in the sprites, It also occasionally looks a bit on the barren side, I would say the colour use on the C64 is probably the best (but not by much).

The ZX Spectrum and Amstrad vesions both have really nice animations for the main sprite as well as all the enemies in the game, they don't have the exact same animations as there is some variation, but both are equally good.

The animation of the C64 version probably has just as many frames, but is completely lacking in finesse, and looks very crude in comparison to the others.

All versions scroll extremely well, none have any scroll issues.

None of the versions have in-game music, which is surprising for the C64 as similar games from the period on the C64 usually have no problems with this sort of gameplay simultaneous with music, I feel this points to a lack of interest on the part of the C64 programmers.

Out of static screens' music I would say that the C64 has the edge.

Amstrad - nothing special, I would say that the only noticible difference between this and the Spectrum version is a better explosion sound.

ZX Spectrum - The Spectrum versions sound effects are pretty much the same as the Amstrad, not really impressive.

C64 - The C64's sound effects are probably the most i'll fitting of the three, though being honest, none of the platforms do particularly well in this category.

The gameplay for all three versions is very much the same, the main difference seems to be that the C64 versions plays faster, which, to be honest I don't feel helps the gameplay at all and doesn't gel as well as other versions (I'm talking about such a minute difference though here that it hardly seems worth mentioning)

The C64 version misses out on much of the personality and feel of the other versions, due in a large part to it's poorer designed sprites and animations, it seems to me that it's a port which didn't receive the time and attention it deserved, instead of turning out better than the other versions with full colour graphics and a nice in-game soundtrack it actually comes across as being more of a cut down version.

Where it comes to the other versions, the Amstrad version comes second out of the three in colour and second in detail (all other aspects are pretty much identical) whereas the Spectrum version comes first overall in detail and 3rd in Colour, In my eyes this would make the Amstrad version the best all-rounder, which is why it's my decision in this circumstance.

This has been a bit of a splitting hairs comparison, as the three version are virtually the same in all but graphics.