## Description
_R.I.S.K._ (Rapid Intercept Seek and Kill) is set on the planet Christon 3
where scientists work on developing new weaponry. Of course the planet gets
attacked by aliens and the player, as a pilot who is nearby, has to drive them
back.
In many ways a Defender variant, the game is a horizontally scrolling shooter
(the player can move in both directions) and the goal is to clear the levels
of all aliens. However, there are certain distinguishing features, notably an
upgradeable space ship.
The game begins in a secure station where the player can repair damage or
upgrade the ship. When everything is ready, a map is shown where the next
target sector is chosen from. Inside a level, a mothership might drop supply
pods, which either repair the ship, fill up ammo or contain ship parts. In
each level, it is also possible to land the craft and allow one of the
scientists to climb in. After a level is clear, the player returns to base
through an underground tunnel. Here there are no dangers, only narrow
platforms on which the player should try to land. A successful landing allows
one to choose from ammo, ship parts or blueprints. Certain combinations of
parts, blueprints and picked up scientists are required to upgrade the ship.
Possible upgrades include faster speed, better fire power or shields.