WPC 2017/Round 17

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The namesake of this round is FAST by Ivan Koswara (Indonesia), held on April Fool's Day, 2014. [1]

Duration: 60 minutes. Total point value: 600 points. Round winner: unofficially Ko Okamoto (Japan), 476 points. officially Philipp Weiß (Germany), 427 points.


Basically, a Screen Test round done on paper. For puzzles with a lot of minor variations, their exact rules on the IB are also given here.

Round note: This round contains 29 puzzles across 29 puzzle types that are more likely to be seen in mainstream puzzle platforms, and are familiar to puzzle enthusiasts regardless of WPC experience. The round contains some observation-based puzzles; please ignore subtle differences due to graphic anomalies or overall distortion.

Points will be deducted for puzzles with limited options, specifically, puzzles numbered 1, 2, 3, 4, 5, 6, 12, 25, 28 and 29. 1 point will be deducted for one error, 3 points for two errors, 6 for three errors, and so on, till 55 points for ten errors. The overall score will not be negative.

1. Sliding Puzzle by Amit Sowani, 15 points
  • Identify the block that can be rearranged to form the given picture. The blocks can slide only horizontally or vertically into the blank cell. The blocks cannot be rotated or reflected.
2. Map Folds (Origami) by Rohan Rao, 5 points
  • The images below represent sheets of paper that were folded and unfolded. The bold grey lines are mountain folds, i.e. folded in, and the dashed grey lines are valley folds, i.e. folded out. Find the image in which the folds are not represented correctly.
3. Rubik's Cube by Swaroop Guggilam, 20 points
  • The Rubiks cube given below is scrambled with the given set of moves. The moves are defined as per the notation in the diagram, where R represents a clockwise rotation of the right (R) surface and R' represents an anticlockwise rotation of the right (R) surface. Identify the final state of the front (F) surface after the scrambling. The opposite faces of the cube are the same.
4. Origami by Amit Sowani, 30 points
  • The Origami model has been made with a grey sheet of paper (white on the back). The sheet is unfolded. Identify the option that represents the appropriate crease lines after unfolding in which only the essential lines are marked. Essential lines are the ones which are present in the final model and not the intermediate folds used for making the model.
5. Isometric View by Amit Sowani, 10 points
  • Identify the image that is the correct top view of the isometric image on the right.
6. Easy Draw (Eulerian Path) by Amit Sowani, 10 points
  • Identify the shape that can be drawn without lifting the pen/pencil or folding the paper, without tracing the same line more than once. The same vertex can be visited multiple times. The ending vertex can be different from the starting one.
7. Number Placement (Numbered Regions) by Amit Sowani, 5 points
  • Place the given set of numbers in the circles. The numbers given inside each shape within the grid represent the sum of numbers in the circles on its vertices.
8. Fill a Pic (Mosaic) by Rohan Rao, 40 points
9. Link a Pic (Number Net) by Amit Sowani, 10 points
10. Nonogram (Paint by Numbers) by Amit Sowani, 60 points
11. Maze a Pic (Maze) by Swaroop Guggilam, 15 points
12. Nearest Exit (Maze) by Amit Sowani, 10 points
  • Identify the nearest exit from the starting point marked by “S”.
13. Count the Shapes by Rakesh Rai, 5 points
14. Quadrilateral Count (Count the Shapes) by Amit Sowani, 15 points
15. Tangram Division by Amit Sowani, 10 points
16. LITS Division (Dissection Puzzle) by Amit Sowani, 15 points
  • Divide the grid into the given tetromino regions (L,I,T,S) along the gridlines. The tetrominoes must be of the same size as depicted and may be rotated but not reflected. Each tetromino shape will be used an equal number of times.
17. Shape Division Optimizer by Amit Sowani, 25 points
  • Divide the grid into congruent parts using the given shape. Congruent parts have the same size but may be rotated or reflected. Maximize the number of parts in the given orientation of the shape, i.e. without rotation and reflection.
18. 3D Division (Dissection Puzzle) by Amit Sowani, 45 points
  • Identify the set of shapes that can be used together to form the given model. There are no additional parts of the model apart from those visible in either the front view or the back view. Colours are only for the representation of 3D shape.
19. Jigsaw by Amit Sowani, 65 points
  • Identify the correct positions of the jigsaw pieces which fit the shaded cells in the grid below so that they form the given image. The gridlines are only for representing the positions of the pieces. The actual sizes of pieces may vary slightly. Pieces can be rotated but not reflected
  • 5 Partial points will be awarded per correctly identified shaded cell.
20. Rescaled Jigsaw (Sliding Puzzle) by Swaroop Guggilam, 30 points
  • Identify the minimum number of swaps required to achieve the given picture. A swap involves the interchanging of two tiles where each tile gets re-scaled to fit the dimensions of the destination tile. The swapped tiles need not be adjacent to each other. Tiles cannot be rotated or reflected.
21. Chronological Order by Amit Sowani, 65 points
22. Falling Dominoes by Amit Sowani, 15 points
23. Picture Slice by Rakesh Rai, 10 points
24. Spot the Differences by Amit Sowani, 15 points
  • Circle ten differences between the image and its reflection. The differences are clearly intentional, such as things that have disappeared, moved, changed size, shape, or orientation.
  • 1 partial point will be awarded per correctly circled difference.
25. Silhouette (Spot the Differences) by Amit Sowani, 20 points
  • Identify the correct silhouette, i.e. dark version of it against a lighter background, for the image.
26. Find a Pair by Swaroop Guggilam, 10 points
27. Hidden Objects by Amit Sowani, 15 points
28. Odd One Out by Amit Sowani, 5 points
29. Instructionless by Amit Sowani, 5 points