Dragon Ball Z Budokai 1 and Budokai 3 have been bundled together to create the Dragon Ball Z Budokai HD Collection. Budokai 1 is entirely in Japanese, and even the HD re-texturing has not improved the graphics greatly, as it was originally an early PS2/Gamecube game. However, Budokai 1 only crosses through to the Cell Saga, and is not where the strength of this HD collection lies.
Indeed, Budokai 3 has become greatly improved through the HD re-texturing process and really adds to the great experience Budokai 3 already is. Budokai 3 travels throughout the Saiyan Saga to the Buu Saga, but also has hidden missions and what-ifs in-between the campaign after completion. The fighting is solid and will leave many hours of enjoyment, especially when playing the free fighting mode, There is also a Tournament mode, where you too can play through the Tenkiachi Budokai Tournament.
The HD collection is available in many places due to the fact it is a fairly recent video game, and will be available at most game shops, but the cheapest deals are to be found on sites like Amazon and eBay, and can be picked up from around £15 upwards.
To conclude, this HD collection is exactly that, a HD re-texturing of the two old Budokai games for the PS2, and is a great game that I would thoroughly recommend to any Dragon Ball Z or fighting action games, as it is genuinely a thrilling fighting experience brought back to the forefront of gaming in this HD collection.