To play you have to land the lander on one of the
 light blue landing pads. When landing you have to
be perfectly level and touch down very gently.

   You have only the main rocket to change your speed
or direction. Pressing the left and right arrow (cursor)
keys spins the lander. You have to spin the lander till
the main rocket is pointing in the direction you want
and then press the space bar to fire the main rocket.

   When the game starts you are above one of the
landing pads- but you are drifting to the right. To
cancel your momentum spin the lander so the rocket
is facing your direction of travel, then fire the rocket
till you come to a stop. Gravity is pulling down on
the lander constantly so you also need to occasionaly
point the rocket down to slow your fall towards the
landscape. By pointing the rocket at a angle you can
change your horizontal speed and vertical speed at the
same time.

   The physics in the game are real. This is what landing
a real space ship on a airless world like the Moon would
be like. Except of course this is only two dimensional.
It's a bit different than the typical video game where your
player responds with instant direction changes according
to the keys pressed.

   Good Luck !