Ah, NERF: Arena Blast. Developed at the same time as Unreal Tournament using a modifed version of the first Unreal engine and releasing almost a month before Unreal Tournament '99, Nerf Arena Blast can be classified as UT99 but aimed at a younger audience and it was marketed as such. No blood, no gore, just a family friendly version of Unreal Tournament and honestly, it actually came out pretty good.
I first played it long ago on a PC Gamer demo disk, and being built on the Unreal engine, it ran flawlessly, transporting me into colourful arenas filled with targets, bells and buzzers, to challenge various brightly clad opponents, in a race to get the most points before the time runs out. The demo contained PointBlast, (a deathmatch style mode where you try to get the most points before you opponents, but this can be done by shooting them OR the various targets scattered throughout the arena) and BallBlast, a gamemode where you try to gather seven numbered balls and shoot them into a goal somewhere in the arena before your opponents can do the same, where it often becomes necessary to shoot you opponents to steal what they are carrying. Tracking down a full version and revisiting it back in 2023, it still ran very well and was an enjoyable time, but now it has all the extras produced by the community over the years that can be thrown into the mix. Thanks to the Unreal engine under the hood, the game was very moddable, with the community producing numerous maps and mods over the years, just like UT99.
For something that was aimed at a younger audience, it could easily have been neutered and ruined like so many kid-friendly games that litter gaming's past, but no, it holds up surprisingly well, running smooth and is essentially a lighter, brighter and cheerier version of Unreal Tournament. That's why i feel it could do with being on GOG for others to experience this unique take on the Unreal Tournament formula.