In Gadget Trial, the player takes the role of guiding Type White throughout the course of the next generation mainstay weapons development trials known as 'Project Next-E'. The objective is to emerge from the trials victorious through winning the battle against your rivals, Type Black.

The game itself is an 'active turn'-based tactical simulation. You will work your way through the stages by making the most of 15 different units, each of which possesses different capabilities. Personalised tactical decisions such as what type of units to produce, how many units to produce, and which facilities to occupy allow the player to enjoy a tactical simulation with simple rules but substantial depth.

Several decades have passed since the last world war. In the Far East, the Eastern Treaty Union - an allied body comprising of the islands in the region - are busy at work on Project 'Next-E', a plan for developing the next generation of mainstay multi-functional weapons of annihilation, or AEWs (Advanced Extripate Weapons) in the form of an accelerated biological computer known as the 'E-Series'. Artificially created human-weapon hybrids, they represent the smallest army in history.

──Of the E-series, there exist two lines adjusted according to different philosophies: Type White and Type Black. The time now comes for their practical trials, with their ultimate adoption by the military at stake.