Abe's first adventure through the land of Oddworld is... awesome!
Oddworld Abe's Oddysee was released in 1997, when 3D gaming was at its prime, the PlayStation was selling rapidly and a lot of the classics we know today were released. Oddworld Abe's Oddysee is about a slave Mudokon in Rupture Farms, who eventually manages to breakout to free the creatures that they are cooking, and to save the other Mudokons from being made into Mudokon Pops.
The graphics in this game were different from the other PS1 games being released at the time, they were fully 3D games, whist Abe's Oddysee is a 2.5d platformer. The character sprites are brilliantly animated and look very fluent. All of the games environments are on (possibly hand-drawn) backgrounds, which sometimes show later levels that you will be going to, needless to say it looks awesome, if not slightly dull at times, because some of the colours are a little bland, but that is my opinion.
The soundtrack is great, there are different songs for different zones, such as Scrabania, Paramonia etc. And the voice acting is brilliant, it's as though it isn't even acting!
The gameplay is in the style of any old-school platformer, you pull levers to open wells that you can jump in to access different areas, you go through several challenges to advance in the game etc. But there are a lot of other things you can do that you can't usually do in other platformers, such as possessing enemies, by 'Chanting', this will make you able to control one of your enemies, and you can do anything from killing them to talking to their friends! There is also a pet you can ride, known as Elum, who looks like a Horse/Llama/Rat thing, and he can help you jump over to hard to reach places, make you move faster etc.
Probably the most important part of the game is known as GameSpeak, this is a system where Abe can talk to certain Mudokons to help them in his adventure, such as putting them through portals by chanting, whistling the correct tune to get through a different area etc. It makes for a very unique and fun style of gameplay.
In conclusion, Oddworld Abe's Oddysee is an instant classic in my eyes, with lots of areas to go to, different styles of gameplay and unique ways to interact with characters, its certainly worth buying, at any cost.