Overdrive (formerly "ZERO Supplies") is a feature in Tanki, allowing players to activate all supplies simultaneously (including mines and repair kits, and excluding gold boxes). Any nearby teammate will also be given this effect.
Upon entering a battle, a progress bar appears at the bottom of the window. Whenever earning experience in battle (capturing flags/points, destroying tanks, healing teammates, etc.), the bar's progress will increase. The bar's progress also increases slightly every few seconds.
When reaching 100%, tankers are able to activate Overdrive (Shift by default). When a player is able to do so, an until activating Overdrive, a star will appear above their tank, only visible to the player and their teammates.
Upon activation, the tanker- along with any nearby teammate- will plant a mine while activating Repair Kit, Double Damage, Double Armor and Speed Boost. Simultaneously, the progress bar will be reset, and begin counting again from 0% to 100%.
Overdrive activation has no effect towards the amount of supplies the player owns, and does not initiate supply cooldowns as well.
At the moment of activation, a sphere of glowing orbs will expand from the tank's center, and collapse back before fading. The orbs are blue for the activating tanker, and green (with a smaller spreading radius) for nearby teammates also affected by the Overdrive activation.
The controls for activating Overdrive can be changed via the settings panel, under the "Controls" tab.
The Overdrive feature was originally released for the 2017 May Holidays, under the name "ZERO Supplies", where it was available from April 29, 2017 to May 10.
The "ZERO Supplies" feature returend during Tanki's 8th birthday, on June 2, 2017, and was available until June 7.
The current Overdrive feature, with its alternate keys option, was released on July 12, 2017.