Riddles, one at a time
Robot Program: The Spiral
Straight arrow: 1 tile forward. Curved arrow: turn on the spot, to its own left or right. Which tile does it stop on?
Turns use the robot's own left and right, and a turn does not move it.
A
A spiral: up 1, right 2, down 3, left 4: tile A.
Glass Overlay: Lines Cancel
Which card completes the grid?
Lines that appear on both cards disappear; all the other lines stay.
B
In each row, lines on both cards cancel and the rest stay. Row 3 gives card B.
Shape Sudoku
Which of the six shapes fits the ? cell?
Start with the box that has the most shapes.
DIAMOND
Solve the whole grid: only a diamond fits there.
How Many Routes: 2 × 2 Grid
Moving only right or up, how many different routes lead from start to the gem?
Each corner's count is the count to its left plus the count below it.
6
Add the ways from the left and from below: 3 + 3 = 6.
Growing Comb
Steps 4 to 9 are not shown. How many tiles will step 10 have?
Each step adds 3 tiles: one on each tooth.
35
A bar of 5, plus 3 teeth of 10 tiles: 5 + 30 = 35.