Singleplayer Version 3 (SPV3) is a mod of Halo Custom Edition that features a revamped version of Halo: Combat Evolved's campaign, including skulls, terminals, new weapons, vehicles and enemies, additional sections of levels and vastly improved graphics. The mod was created by the Custom Mapping Team, headed by Masterz1337, a group of modders who have developed several other Halo Custom Edition mods in the past, such as SPV2. The mod is not endorsed or supported in any way by 343 Industries or Microsoft.
SPV3's campaign follows largely the same story as Halo: Combat Evolved and Halo: The Flood, but with additional characters and events. It was designed so that it could effectively take the place of those two pieces of Halo media, without causing any discrepancies or inconsistencies in the process.
SPV3 consists of 10 levels from the CE campaign and 1 original level.
The gameplay in the mod is largely similar to that featured Halo: CE, albeit with a larger sandbox of weapons, vehicles and enemies. In addition, features such as boarding, vehicle EMP, loadouts and armour abilities from later Halo titles have been introduced. The developers aimed to preserve the design philosophy of Halo: CE, allowing for enemy encounters where the player is allowed to choose how to approach the situation rather than being forced through a linear path.