New puzzle: `Inertia', originally written for Windows by Ben

Olmstead and reimplemented with the help of his source code which he
was kind enough to release into the public domain.

[originally from svn r6222]

Recipe

@@ -28,7 +28,7 @@ LOOPY    = loopy tree234 dsf
 
 ALL      = list NET NETSLIDE cube fifteen sixteen rect pattern solo twiddle
          + MINES samegame FLIP guess PEGS dominosa UNTANGLE blackbox SLANT
-         + lightup MAP LOOPY
+         + lightup MAP LOOPY inertia
 
 GTK      = gtk printing ps
 
@@ -53,6 +53,7 @@ slant    : [X] GTK COMMON SLANT
 lightup  : [X] GTK COMMON lightup
 map      : [X] GTK COMMON MAP
 loopy    : [X] GTK COMMON LOOPY
+inertia  : [X] GTK COMMON inertia
 
 # Auxiliary command-line programs.
 solosolver :    [U] solo[STANDALONE_SOLVER] malloc
@@ -88,6 +89,7 @@ slant    : [G] WINDOWS COMMON SLANT
 lightup  : [G] WINDOWS COMMON lightup
 map      : [G] WINDOWS COMMON MAP
 loopy    : [G] WINDOWS COMMON LOOPY
+inertia  : [G] WINDOWS COMMON inertia
 
 # Mac OS X unified application containing all the puzzles.
 Puzzles  : [MX] osx osx.icns osx-info.plist COMMON ALL
@@ -180,7 +182,7 @@ install:
 	for i in cube net netslide fifteen sixteen twiddle \
 	         pattern rect solo mines samegame flip guess \
 		 pegs dominosa untangle blackbox slant lightup \
-		 map loopy; do \
+		 map loopy inertia; do \
 		$(INSTALL_PROGRAM) -m 755 $$i $(DESTDIR)$(gamesdir)/$$i; \
 	done
 !end

list.c

@@ -23,6 +23,7 @@ extern const game dominosa;
 extern const game fifteen;
 extern const game flip;
 extern const game guess;
+extern const game inertia;
 extern const game lightup;
 extern const game loopy;
 extern const game map;
@@ -46,6 +47,7 @@ const game *gamelist[] = {
     &fifteen,
     &flip,
     &guess,
+    &inertia,
     &lightup,
     &loopy,
     &map,

puzzles.but

@@ -1715,6 +1715,58 @@ CPU time and memory. Be warned!
 }
 
 
+\C{inertia} \i{Inertia}
+
+\cfg{winhelp-topic}{games.inertia}
+
+You are a small green ball sitting in a grid full of obstacles. Your
+aim is to collect all the gems without running into any mines.
+
+You can move the ball in any orthogonal \e{or diagonal} direction.
+Once the ball starts moving, it will continue until something stops
+it. A wall directly in its path will stop it (but if it is moving
+diagonally, it will move through a diagonal gap between two other
+walls without stopping). Also, some of the squares are \q{stops};
+when the ball moves on to a stop, it will stop moving no matter what
+direction it was going in. Gems do \e{not} stop the ball; it picks
+them up and keeps on going.
+
+Running into a mine is fatal. Even if you picked up the last gem in
+the same move which then hit a mine, the game will count you as dead
+rather than victorious.
+
+This game was originally implemented for Windows by Ben Olmstead
+\k{bem}, who was kind enough to release his source code on request
+so that it could be re-implemented for this collection.
+
+\B{bem} \W{http://xn13.com/}\cw{http://xn13.com/}
+
+\H{inertia-controls} \i{Inertia controls}
+
+\IM{Inertia controls} controls, for Inertia
+\IM{Inertia controls} keys, for Inertia
+\IM{Inertia controls} shortcuts (keyboard), for Inertia
+
+You can move the ball in any of the eight directions using the
+numeric keypad. Alternatively, if you click the left mouse button on
+the grid, the ball will begin a move in the general direction of
+where you clicked.
+
+All the actions described in \k{common-actions} are also available.
+In particular, if you do run into a mine and die, you can use the
+Undo function and resume playing from before the fatal move. The
+game will keep track of the number of times you have done this.
+
+\H{inertia-parameters} \I{parameters, for Inertia}Inertia parameters
+
+These parameters are available from the \q{Custom...} option on the
+\q{Type} menu.
+
+\dt \e{Width}, \e{Height}
+
+\dd Size of grid in squares.
+
+
 \A{licence} \I{MIT licence}\ii{Licence}
 
 This software is \i{copyright} 2004-2005 Simon Tatham.