numptyphysics - Crayon-based physics puzzle game
Numpty Physics is a Crayon-drawing puzzle game in the spirit of Crayon
Physics using the same excellent Box2D engine. It melds cute
schoolbook-style graphics with a kind of realistic physics engine. It
includes a built-in editor so that you may build (and submit) your own
A summary of the keys supported is included below.
stylus draw a new stroke
space or enter pause/unpause physics
esc or backspace undo last stroke
r or up reset level to initial state
n or right skip to next level
p or left go to previous level
e or fullscreen edit mode
Each stroke is like a rigid piece of wire with a mass proportional to
its length. A closed stroke is just a wire bent into a shape, it has no
substance apart from its perimeter.
The ends of a strokes can (and will) join onto other strokes when drawn
near enough to another stroke. These joints are pivots so you can use
this to build levers, pendulums and other mechanical wonders.
Jointed strokes don’t collide with each other. Join both ends to make a
Play bugs: goal item does not respawn if lost.
Keys: (as per play mode plus the following)
e or fullscreen leave edit mode
s or menu save to ~/.numptyphysics/L99_saved.nph
zoom-minus + stylus delete stroke at point
zoom-plus + stylus drag stroke at point
It’s handy to pause the physics when making a new level though this is
by no means necessary. Sometimes it is handy to let the physics run for
a little bit just to let the items settle down.
From the editor palette you can choose the crayon colour and then
additional properties such as:
* ground (earth arrow) - stroke is fixed in place.
* sleeping (Zzz) - stroke is not subject to physics until bumped by
* decorator (dashed D) - stroke is not part of the physical world.
eg: tutorial text.
You should make sure that your level has at least one red item (player
token) and at least one yellow item (goal item).
Token strokes will only join to other token strokes. Goal strokes will
only join to goal strokes. Other strokes will happily join to any non-
token non-goal strokes.
If this is your first time, you may need to restart the game for your
saved L99 to show up.
If you wish to be clever, edit the level file directly - it’s just a
simple text format.
Editor bugs: There is not yet any provision to name your level but you
can just rename the file to anything.
This manual page was written by Gabriele Giacone <email@example.com>
for the Debian system (but may be used by others). Permission is
granted to copy, distribute and/or modify this document under the terms
of the GNU General Public License, Version 3 any later version
published by the Free Software Foundation.
December 30, 2009 numptyphysics(6)