Early Access to Ion Maiden is now underway on Steam, offering the chance to party like it's 1996 with a new Build-engine shooter published by 3D Realms. This is a preview campaign, and GOG.com says it's also available there, but restricted to owners of the Bombshell Digital Deluxe Edition. Here's a reveal trailer and here's word from this announcement:

3D Realms is proud to bring back the Build engine, which powered Duke Nukem 3D, Blood, and Shadow Warrior, in all of its hand-crafted pixelated glory.

We’ve spent a lot of time tinkering under the hood to take advantage of new technology and techniques. Bigger levels, hundreds of new colors, and morphing maps that transform mid-level are all just a few of the advancements made to the engine.

Today we're releasing the ION MAIDEN in Early Access!

Early Access owners will be granted immediate access to an exclusive multi-hour preview campaign, which you can play RIGHT NOW!

This is a big moment for us - The first official 3D Realms IP to launch as a Build Engine FPS since Shadow Warrior.