The Fire TV game Cyboid has just gone free for the first time. This is a high-speed 3D first-person shooter game that is reminiscent of the old Quake games. The game normally costs $1.99, but the developer is experimenting with a new subscription model that unlocks all in-app purchasable extras in the game for a $0.99 monthly subscription, so they’re offering it for free to gauge the new option. Even if you don’t pay the subscription or buy any of the in-app items, there is plenty of fun to be had with what is included with the core game, which is what you’re getting for free during this sale. The sale is scheduled to end on April 5th. The game is also available on sale and for free for Fire tablets as a separate app.