Rodland plays similarly to Bubble Bobble, it's basically a single screen game where you have to clear each stage of enemies to move on. Instead of using bubbles it has you grabbing the enemies with rods and then smacking them back and forth (hopefully catching multiple enemies in the way). The game doesn't actually let you jump, but gives you the ability to build ladders wherever you want instead.
C64 - The Commodore version plays extremely well, it's a very good speed and the difficulty curve is quite well judged.
There are a few differences to the arcade original here though, your ladders can now be used to pick up flowers, and swinging enemies into each other kills them much faster as you don't let one of them go when they impact. I've thought about this for a while and feel that both these differences have a positive effect on the gameplay, granted they make the game a little easier but I do feel that collecting all the flowers is now less tedious and more tactics based than before, and due to the faster impact kills there's now less instances of frustrating deaths.
Some of the less positive (though relatively minor) changes here are that the enemies are not placed the same way as in the original (a level of the arcade which maybe only had sharks originally may well on the C64 version have the bee enemy instead for instance) this does have an effect on gameplay as each enemy type has different abilities to each other. Outside of the enemy placings you also no longer receive items during boss fights (and occasionally can't use ladders either) and you no longer stun enemies when you hit them with the tip of your weapon.
Spectrum - The gameplay in this version is actually the most accurate to the arcade out of them all, at first I thought there may have been levels missing but after a thorough check I've found that the levels at least match up to those in the Commodore version, the only difference is the placings of the boss battles which happen at different times to the other versions (the arcade original actually changed it's boss appearances around based on how well you're doing so the Spectrum version isn't any less accurate in this fashion to the others).
Like the Commodore version this also plays very well, it gives your weapon much more reach than the other versions (like in the arcade), you can use items during boss fights, and ladders during the whale boss, hitting enemies from too far away stuns them instead of grabbing (whilst more accurate this can be annoying), slamming them into each other kills one and bounces the other, and ladders do not collect flowers. One of the more noteworthy accuracies here is that the enemies are in the same positions as they were in the arcade.
Where it comes to inaccuracies I did notice was that the enemies no longer timed out and became more dangerous, this wasn't really much of a common occurrence in the arcade version though as it would usually give you more than enough time anyway. There's also some slowdown here but thankfully its relatively rare, and only really happens when you use the weapon items whilst there's a lot going on on-screen.
NES - Unfortunately this version's gameplay is plagued by many damaging inaccuracies. Firstly your weapon's reach in this version is very short, which makes swinging enemies into each other a little bit more of a problem here than usual, and even worse they no longer actually kill each other when slammed together (the one in the way is just pushed back instead of killed). Also, If an enemy gets slammed into an area where there's no ground it disengages and drops, this may be more realistic to reality but is not true to the arcade and is very annoying as it means that you can't grab an enemy if you're standing at the edge of a platform as you'll always end up swinging them off the edge and dropping them, it also means that you can no longer grab enemies in mid air as they fall.
Secondly, many of the items here are now underpowered in comparison to the other versions, the bounce weapon for example no longer travels through the platforms (they hit them and then rebound making them next to useless on many of the levels), and the bomb explosion is now about 1/3rd the size it's supposed to be.
Like the C64 version Ladders here can also be used to collect flowers and the enemies are also placed wrongly (suspiciously they're placed wrongly in pretty much the same way as they were in the C64 port, which, added to the fact that the backgrounds and music are nothing like the arcade's makes me worry that the earlier C64 port was actually the frame of reference for the programmer and not the arcade version).
Lastly (and possibly most importantly) the boss battles have all been changed, some in only a minor fashion, (the crocodiles for instance now move independently so you have to move up and down more to pursue them, which is a little bit more of a pain in the arse), and others in a major fashion (the whale fight now takes place underwater, and has it charging at you instead of rising from the background, the Elephant boss has a platforming section tacked on).
Apart from all of the inaccuracies this version's pacing is notably worse, and descends into tedium faster.
Amstrad - Easily the worst of the bunch, and by no small measure. This version is just too slow to be fun as it moves at maybe half the speed of the other versions. Even more unfortunate is the fact that all the boss battles seem to be completely absent (I reached level 21 and had still yet to see any at all).