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Assassins - Ultimate CD Games Collection 2
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Assassins 2 - Ultimate Games No. 2 (1995)(Weird Science)[!][Amiga-CD32-CDTV].iso
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arcade
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tractor_beam
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tractorbeam.doc
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1992-09-02
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=====================================================================
TRACTOR BEAM INSTRUCTIONS
(c) James Lean
=====================================================================
Tractor Beam is one of those games which can get really annoying
quite quickly. The basic idea is to manoeuvre your droid ship from the left
hand side of the screen to the right, pick up a box with your tractor beam
and carry it back again. This sounds simple except for the fact that your
tractor beam shows all the same properties as long strip of elastic, and
so can rapidly become very difficult to control. Also, touching anything
is fatal for you and the box.
The normal screen-setup looks something like this:
#######################################################
# #
# #
# #
# #
# #
# #
# #
# #
# _________ #
#You start here | | Box starts here #
# || | | || #
# \/ | | \/ #
# ________ | | _______ #
#######################################################
You start each level floating in the left-hand pool of water, and the box
starts in the right. Using the joystick you must move your droid so it is
just above the box, and click fire to activate the beam. Then (very
gently) drag the box back to your pool and gently set it down, clicking
fire again to release the beam. Once the box has settled you need only to
land in the pool next to it to progress to the next level. Each level is a
variation on the above screen setup, possessing different tractor-beam
characteristics, gravity levels, thruster powers etc.
Each level has its own password which appears on the statistics screen,
allowing each level to be accessed from the title screen by pushing the
joystick up and pressing fire.
Most levels also contain static and moving obstacles to get in your way,
or just to make playing more interesting:
Arrows - These red arrows propel your droid in the
direction of the arrow, often with more force
than your thrusters can match. Be careful not to
become caught in a line of arrows, as they will
almost certainly smash you into the side of the
screen.
Spikes - These look like normal blocks, except that sharp
spikes can suddenly stick out, fatal to your droid
or box if you come into contact with them.
Patrol Droids - These large droids can move up and down or left
and right, and are fatal to your droid or box if
touched.
To control your droid just use the joystick, pushing in the direction which
you want to move. Be careful that you often need to slow down by thrusting
in the other direction. On clicking and releasing the fire button your
tractor beam is activated, and on clicking the second time is it released.
Note that the tractor beam can only be activated when your distance from
the block is below the maximum slack length of the beam, to avoid
accidents. Setting of the box down in the pool must be done gently, as too
hard a splash-down will destroy the box.
Once a level has been completed you are given a bonus score depending on
your efficiency. The bonus starts at a maximum of 5000, and is decreased
for each unit of fuel used, and every box breakage. The final bonus is
then added to your score.
The title screen displays the score from the previous game, as well as the
furthest level reached in that game. To continue from that level (with the
score reset), pull the joystick down and press fire. Simply pressing fire
on its own starts again from level 1.
Tips on Playing
~~~~ ~~ ~~~~~~~
Be gentle with the controls, especially when the tractor beam is in
operation.
If you and the box just start 'boinging' around (you will know what I mean
after playing the game), try to match the box's upward velocity with the
beam slack, then as you both start to fall, gently apply small amounts of
thrust.
On some occasions you may have to slingshot the box through small gaps, so
get plenty of box-control practice on the first level.
=====================================================================
The making of this game:
I have been meaning to make this game for years, ever since I
heard about 'Thrust' on the BBC. Until now however, I have never actually
managed to get the physics to work properly. After working it all out on
paper a couple of weeks ago it suddenly seemed to work, so I have spent
the time between now and then making a playable game out of it.
The program is written in AMOS basic and was compiled using the AMOS
compiler.
The whole program centres around this formula:
T = @x / l
where T is the tension on the beam, x is the extension of the beam and l
is the unextended length. @ is the coefficient of elasticity, which just
basically means the lower that @ is the easier the tractor beam stretches.
The tension worked out by this applies as a force on both the droid and
the box, through the equation:
F = ma
where the F is taken as the value of T, m is the mass of the object, and a
is the resulting acceleration.
=====================================================================
Just before the end of this file, I would like to thank the following
people for their contributions to the game:
My brothers Richard and Peter - Richard helped with the physics side of
the game, providing me with the original
elastic formulae. Peter is always playing
the game, offering me advice on how it
could be improved, as well as designing
level 9 on my level editor.
Mark Shaw - He played the game and demonstrated all
of its little bugs, and helped design
level 6.
=====================================================================
James Lean
9 Stone Close
Taunton
TA1 4YG