Instructions

Basic Rules

Bubbles appear from the gate on the map and continuously move towards the base. If a bubble reaches the base, the base takes damage, and if the base's shield reaches zero, the player loses.

Players can place weapon blocks on the map to attack the bubbles. Defend the base from enemy invasion for 100 waves.

The path of the bubbles can be altered by how you place the weapon blocks. Try to set them up to make the path as long as possible.

Money is required to place weapon blocks. Money increases gradually as you destroy bubbles.

You can upgrade the placed weapons using additional money. Also, if a weapon becomes unnecessary, you can sell it to convert it back into money.

Types of Weapons

Gun

The most basic weapon that fires bullets. It has a short range and low power, but it's cheap and suitable for placing in large numbers. Upgrading it increases its rate of fire.

Bomb

A weapon that fires bombs to attack with an explosion. It has a short range and low power, but it can damage multiple enemies at once. Upgrading it increases the explosion range.

Slow

A weapon that slows down the movement of surrounding enemies. It doesn't have attack capabilities, but it can enhance the damage dealt by other weapons when used in combination. Upgrading it increases its effectiveness and range.

Railgun

A powerful weapon that fires bullets. It has a long range and high power but is the most expensive. Upgrading it further increases its power.

Missile

A weapon that fires missiles to attack with an explosion. It has a long range and high power. Its homing performance is not very high, so it might miss the target. Upgrading it increases its power.

Boost

A weapon that enhances the power of surrounding weapons. It doesn't have attack capabilities, but if used well, it can give you an advantage in attacking. Upgrading it increases its effectiveness and range.

Types of Bubbles

Normal

The most basic type of bubble.

Bulletproof

The effectiveness of bullet weapons is halved, while the effectiveness of explosive weapons is doubled.

Explosion-proof

The effectiveness of bullet weapons is doubled, while the effectiveness of explosive weapons is halved.

Small

These have half the durability of normal bubbles but appear in large numbers. There are also bulletproof and explosion-proof variants.

Split

After taking a certain amount of damage, it splits into four smaller bubbles. There are also bulletproof and explosion-proof variants.

Boss

Appears in waves 50 and 100. It appears alone but has very high durability. There are also bulletproof and explosion-proof variants.

Techniques

The score multiplier is the square of the number of bubbles appearing simultaneously. To aim for a high score, you need to fight with the minimum number of weapons, but this increases the risk.

If you repel all enemies without taking any damage, you get a perfect bonus.