The setting for the game takes place roughly one year after the events of the first game.Like the first game, the first trial is a tutorial one that guides the player, Phoenix Wright, into all of the elements of the Ace Attorney courtroom. This is established by having Phoenix receive amnesia due to a head trauma. The remaining three trials are united by the mysterious disappearance of prosecutor Miles Edgeworth. Justice For All plays similarly to the first Ace Attorney game as a visual novel/adventure game. While the game has been adapted from the GBA version to use the DS touch screen, none of the special investigation techniques introduced in the "Rise from the Ashes" case from the first game reappear. A small but significant change is that a player can now present the profiles of people involved with the case, in addition to the evidence in the Court Record. The player can present them either during the court room or investigative phases. Justice for All features a new gameplay concept called Psyche-Lock. Phoenix Wright has to unlock several locks that have been placed over a witness' heart in order to reveal the truth. [Edited from [url=http://en.wikipedia.org/wiki/Phoenix_Wright:_Ace_Attorney_-_Justice_for_All]Wikipedia[/url]]

逆转裁判是CAPCOM公司于2001年至今在GBA以及NDS平台上推出的法庭辩论AVG型系列游戏，至今未有类似游戏出现。游戏者将扮演辩护律师，进行一系列的搜证和推理，并在法庭上与证人对峙，与罪犯周旋，从各种证词中找出案件的关键矛盾，通过抽丝剥茧地推理，最终找出真凶。由于其新颖的游戏方式和游戏带来的紧张刺激的投入感，受到了许多游戏玩家的好评。 系列前3作和“复苏的逆转”的主角都是律师成步堂龙一（成歩堂龙一、なるほとう りゅういち）。4代的主角则是王泥喜法介（王泥喜法介、おどろき ほうすけ）。 游戏分为通过反复移动和对话收集法庭的情报和证据的“侦探部分”和利用收集的证据为武器为被告人辩护的“法庭部分”。在法庭上，自己手上的情报和证据会与检察方的证据不断会合、听取证人的证词、寻问出其中与事实不符的部分，即找出所谓的“矛盾”是这个游戏系统的原则。当矛盾不断暴露后，事件的“真相”也就渐渐地明朗，最终的目的是为委托人的无罪立证。 由于制作上的原因，游戏里的审判制度与2000年代现实中的日本有很大差别，最大的不同就是本游戏中特有的序审法庭制度。游戏中审判长手中的木槌在现实中的日本法庭并没用使用，而且日本法庭上也很少有人会喊“异议あり（我反对）”。不仅如此，律师也不会向证人大叫，而是律师与检察官之间互相质问和寻问。而像游戏中那样辩护人和检察官之外的人，在家庭/简易/地方裁判所里，也被允许作为“特别辩护人”出庭。 本作是系列第一作，全4话。因为当时没有打算出续篇，第4话就收回了所有的伏笔。系统在当时就基本完善了，续篇中未见有大的变动。