DISCLAIMER - TO HAVE THIS ADDON FULLY WORKING YOU MUST LAUNCH IT TOGETHER WITH MONSTER PACK EXTRA ULTIMATE AS IT USES SPRITES FROM THAT ADDON
There are four different vehicles that you can enter and they are used only by Zombies - three of them are tanks (Autocannon, Missile, Plasma) and is a Flyer that has no problems with reaching every place (except blocked with collisions). Flyer is the fastest one with of course a possibility to fly quickly, it is also the most unarmoured of all four vehicles available, it's armed with dual laser cannons and excavator bombs, the latter has limited ammo due to sheer damage. The green Autocannon Tank has 1800 armor (like all tanks, compared to 500 of Flyer), is slower when compared to Flyer but you can crouch with it to reach small shafts and other places, as a secondary you throw proximity mines, ammo limited. Next there is a red Missile Tank that is the best option against clusters of enemies and flying enemies because of the seeker missiles (must be replenished), the sheer firepower of this tank is great and works against every enemy. The last available is the gray Plasma Tank, it is between a slow rate of fire of the Missile Tank and fast Autocannons, Plasma Cannons work against any enemy you will encounter, as a secondary you have Stun projectiles from the Lightning Gun. When using the Tanks and Flyer you must remember about one crucial thing how to leave it - when you press both crouch and jump you will exit the vehicle, pretty much the same as it was in Metal Slug (celatoss also made the Metal Slug Addon).
UPDATE 06.12.2022