LogFAQs > #914026593

The only KH game that you really don't need to play or watch is Coded. It has minimal plot relevance to the overall story. It mostly hints to the data implanted in Sora having some significance, everything else is basically irrelevant.

BBS introduces us to the Primary antagonist, Xehanort, and details his goals, as well as introduces us to Terra, Aqua, and Ven which are important to the series as a whole, considering Xehanort possessed Terra, and eventually getting amnesia, later becoming Ansem SoD and Xemnas. Aqua getting lost in the Realm of Darkness, and Vens heart residing within Sora, as well as TAV being instrumental for Sora, Riku, and Kairi being able to wield keyblades.

358/2 days gives us detailed events involving Roxas time in the Organization and introduces us to Organization XIII. It also shows the events leading to Roxas betraying the Organization.

Dream Drop Distance takes place immediately after KH2 where Sora and Riku are being tested to become Keyblade Masters, and explains the true goal of Organization XIII, which leads directly to KH3.

They all have information relevant to the overall plot and characters. It's only convulted because people only think the necessary games are 1, 2, and 3.
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Strider is something of a god of equine necro-brutality--Master ZED