Mk48.io is a multiplayer naval combat game. You start off a small ship, and consume crates to increase your score (to level up your ship). While a small amount of crates spawn naturally, sinking other ships directly increases your score and spawns many more crates.
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There are four ways to move your ship:
Once your ship is moving in a direction, it will keep moving, to let you focus on using your weapons.
If using mouse controls, your ship will turn to point towards your mouse. You can control the speed of your ship by using your mouse position between the two rings as a throttle. If your mouse is outside the outer ring, your ship will increase to maximum speed.
Just like in real life, there are many different types of ships, each with different advantages.
Once you earn enough points, you are able to upgrade your ship to the next level. The upgrade choices are shown in top-middle of the screen when an upgrade is available. Be careful when upgrading, as becoming a larger ship may lead to crashing into land or a reduction in mobility if the water is too shallow.
Enemies are more likely to detect larger ships. However, some modern ships have a property known as stealth to help you evade detection.
Here is a full list of ships: Mk48.io Ships
There are multiple different types of weapons available on various ships. In general, weapons are fired by clicking in the appropriate direction (although the Space key can also be used).
Once fired, all weapons take some time to reload. Each type of weapon and each turret reload independently. Consuming crates speeds up reloading, while using weapons underwater slows it down.
All ships have some combination of sensors to identify other ships and obstacles:
There are two modes for sensors, active and passive. Passive mode listens for emissions (e.g. sound in the case of sonar) from other entities. Active mode emits a signal and resolves contacts based on the signals that bounce back. In general, active mode allows you to see more, but has the potential to give away your position.
To visualize sensor data, look at the dots surrounding the outer circle around your ship:
If a contact is on the border of your sensor range, it will appear as an arrow. In this case, you know something is there, but not what it is.
You can join up to five other players to form a fleet, using the panel in the top left corner of the screen. Once you have a fleet, other players can request to join it. You can then approve or deny them. Members of a fleet cannot hurt each other with weapons. Importantly, you cannot request to join a fleet until you are close enough to see one of its members, and the fleet has slots remaining.
If you want to try experimental features (at your own risk), enable the Beta program.