How to Play
Sudoku

Fill in the empty cells so that the numbers 1 through 8 appear in every “row”. Unlike in standard square Sudoku, where each cell belongs to one row, one column and one 3×3 block, in hyperbolic Sudoku each cell belongs to three different rows, and there are no 3×3 blocks at all. For example, in the puzzle shown below, the central yellow cell belongs to the green row (○ ○ 7 4 ○ 6 5 8), the blue row (3 1 4 ○ 5 7 8 ○) and the red row (3 ○ ○ 5 ○ 6 4 ○); the only number missing from those three rows is 2, so we can write a 2 into the yellow cell.

Sudoku.png
Pool

Touch the cue stick to get a blue dot (a control handle). Drag the blue dot around to align your shot. When you’re satisfied with the alignment, tap the blue dot to make the shot.

Pool.png

In hyperbolic geometry, the phenomenon of geodesic divergence means that a very small difference in how you align the cue stick can make a large difference in where the ball ends up. This is not an easy game! For a break, go to the Surface menu and switch to the Flat surface for a while. While a pool ball’s path on a hyperbolic surface is typically chaotic (in the technical sense), on a flat surface it’s much more predictable (always keeping a constant slope) and on a spherical surface it’s always perfectly periodic.

Maze

Drag the mouse to the cheese.

Solving a maze while dragging the board is easy. For a (slightly) greater challenge, try solving a few mazes without scrolling the board. This will give you a better feel for the Klein quartic surface on which the hyperbolic mazes are drawn.

Still have a question? Submit it to the Geometry Games Contact Page for a more-or-less prompt reply.

The latest Hyperbolic Games are freely available at www.geometrygames.org/HyperbolicGames. The Hyperbolic Games may be freely distributed under the terms of the GNU General Public License.

© 2018 by Jeff Weeks