Link to puzzle. Here's where I'm up to so far. Red lines indicate the path, and solid black lines are walls (ie. I've determined it's impossible for a path to go through). Did I misread the puzzle? One of the rules states that in the left room, "You must step on every tile in the s-shaped region"...

Can you tile a 15x16 rectangle using eight rectangles whose sizes are 1x2, 2x3, 3x4, ... 8x9? No two rectangles can be the same size.

Your goal is to maximize the absolute difference of the numbers marked ?. (? marks indicate region areas. They may or may not belong in the same region which another number or ?. They may or may not be shaded.) Answers must prove their claim (and provide a construction). Normal Chocolate Banana ...

This too is a Colombian Sudoku by Xavier Castillo. The usual rules apply. The dots outside the board on top indicate how many cells in the corresponding column or row of that board contain precisely the same digit as is to be found in the same cell of the solved Sudoku below. Additionally, digits...

Since 37 is my favorite integer and π is my favorite number, here's another puzzle: Normal Chocolate Banana rules apply. Rules: Paint some of the cells black. Black cells linked orthogonally must always form a rectangle (or a square). Non-blacked cells linked orthogonally must not form a rect...

Find the algorithm that was used to create the following sequence of numbers: BAH BAA BBA BAD BBD BAG BBG BAJ BBJ BBC BCC BBF BCF BBI BCI BCB BDB BCE BDE BCH BDH BDA BEA BDD BED BDG BEG BDJ BEJ BEC BFC BEF BFF BEI BFI BFB BGB BFE BGE BFH BGH BGA BHA BGD BHD BGG BHG BGJ BHJ BHC BIC BHF BIF BHI BI...