Exp3D is a free-to-play vertical space-shooter game developed by Breaking Byte for Android devices. It is a tribute to old-school Japanese shmups and offers 4 chapters with unique bosses, full 3D environment and ships, epic soundtrack, bonus and ship upgrades, and no shady Android permission. The game also features a 60 FPS fast-paced action that keeps the players engaged throughout the game.

The gameplay is simple yet challenging, where players have to move their ship around by touching the screen and dodge enemy bullets. The special weapon reloads over time, and when it's fully loaded, double-tap anywhere or touch its icon to unleash its power. Players can grab orbs dropped by enemies to upgrade their ship and unlock new content. The game also offers several bonuses such as "Hellfire," "Time Warp," and "Super Shield" that provide a temporary boost to the player's performance.

Overall, Exp3D is an enjoyable and engaging game for hardcore gamers who like a challenge. The game is free to play, but players need to clear all the chapters at 100% to unlock new levels and ship upgrades.