The participants must solve the puzzles by themselves.
The following aids are not allowed:
The following aids are not allowed unless explicitly allowed by a specific puzzle:
A translation dictionary, for the sole purpose of translating instructions and rules to the participant’s native language, is permitted, but it may not be used to solve puzzles.
This list of aids is not intended to be complete. In case of doubt as to whether an aid is permissible, please contact the contest organizers.
The format of the tournament will be papersolving with transcription of solutions.
The tournament always starts on Fridays 12:00:00 (GMT +2 hours) and ends on Mondays 23:59:59 (GMT +2 hours). No solutions submitted after the end of the competition will be accepted.
The length of each round will be 90 minutes.
There will be 8 Sudoku rounds.
Each round will contain a mix of classic Sudoku puzzles and Sudoku variants.
Each puzzle has its own point value. To get the points for particular puzzles it is necessary to enter the right answer – it means to enter the marked part of the solution into the readymade answering form. In case the solution is incorrect, the participant will not get any points. If the participant submits multiple times, only the last submission within the tournament time limit will be scored (although the judges reserve the right to look at previous submissions for adjudicate claims of computer failure or other irregularities). Acquired points given for the correctlysolved puzzles are crucial for the ranking. In case a tiebreak is needed with puzzles of the same point value there will be another criterion – the time in which the particular player sent the last correct solution.
No points are taken away for incorrect answers – an incorrect answer gives the same score as not solving the puzzle.
Each Round will be out of some number of points, generally scaled to around 10 points per minute (or 1 point for every 6 seconds) of the bestprojected solving times.
A participant’s Round Score for each round is the sum of points earned for solving puzzles, plus any Time Bonus as described in the next sentence. A participant who finishes early will receive a time bonus worth an additional 10 points per minute remaining, calculated to the second. To begin earning time bonus, a participant must click a "Claim Bonus" button that will confirm they are finished with the test and done checking puzzles. After “Claim Bonus” is clicked, no more submissions will be graded.
If a solver submits a 100% correct set of solutions eligible for time bonus, but fails to click the claim button, the solver will begin to earn time bonus after five minutes have passed. This only applies to fully correct solutions and no partial bonus will be granted when the claim button is not clicked. All bonuses will be calculated based on the time the player clicks the claim button, or 5 minutes after the last (and 100% correct) submission was made, whichever is earliest.
Sometimes solvers claiming time bonus may make a mistake on a puzzle entry. If, in the opinion of the competition judges, a solver has completed the test with all but 1 puzzle correct, and a typo or small mistake was made on that one puzzle, then that solver will receive 80% of the time bonus credit that they might have earned (8 points per minute). However, the solver will not receive credit for the incorrect puzzle.
At the end of the Grand Prix, the 10 Sudoku GP solvers with the highest playoffqualifying scores (see below) will be invited to the next WSC to play off in person. If there is a tie in the results of the top 10 solvers, the solver with the highest ranking in any individual tournament will win the tiebreaker; if there is still a tie, then the solver with the nexthighest ranking in any individual tournament will win, etc. If any of the finalists decides not to attend the WSC, the next best solver (or solvers) will be invited to take part.
A participant’s playoffqualifying score is the sum of their six highest Round Scores (including any time bonus). Like previous years, there will not be any normalizing of scores.
Judging will be conducted by the Grand Prix web site in consultation with the WPF/Grand Prix Competition Committee to ensure uniformity across all of the Grand Prix contests. Any protests must be submitted within 48 hours of the end of the competition to the WPF Competition Director for final review. The WPF Sudoku GP Director is Nikola Zivanovic (SRB)
The playoff to the WPF Sudoku Grand Prix 2018 is designed to be a representative and exciting finale to the online rounds. Each finalist will solve a total of 8 puzzles, with one type of puzzle chosen from each of the online rounds. The puzzles are designed to be of roughly equal difficulty, and the playoff is expected to last no longer than 50 minutes in total.
The participants must solve the puzzles by themselves.
The following aids are not allowed:
The following aids are not allowed unless explicitly allowed by a specific puzzle:
A translation dictionary, for the sole purpose of translating instructions and rules to the participant’s native language, is permitted, but it may not be used to solve puzzles.
This list of aids is not intended to be complete. In case of doubt as to whether an aid is permissible, please contact the contest organizers.
The WPF Puzzle GP is an 8round tournament, with one round held every four weeks, with a playoff round held at the World Puzzle Championship (WPC). The puzzles will be released in PDF format; it is expected that participants will print out the PDF locally, solve the puzzles on paper, and submit answers online that illustrate that they have solved the puzzles correctly.
There are three separate divisions, lettered A, B, and C. Each division will have a separate leaderboard, but there will be one common set of puzzles. Participants are segregated into three ranking classes, also lettered A, B, and C, based on their current and past results. All participants are eligible to appear on the leaderboard in Division A. Class A are not eligible to appear on the leaderboard in Division B. Class A and Class B participants are not eligible to appear on the leaderboard in Division C. The following chart may make this clearer:
Class A 
Class B 
Class C 

Division A 
Rank 
Rank 
Rank 
Division B 
No Rank 
Rank 
Rank 
Division C 
No Rank 
No Rank 
Rank 
A participant’s Class will not change during the year, but will be updated at the end of the year in time for the next year’s edition. Generally, we expect highlycompetitive participants to be in Class A, experienced participants to be in Class B, and inexperienced participants to be in Class C.
On the Friday of the round, 12:00:00 (GMT +2 hours), the puzzles become available to each participant. The participant has 90 minutes to submit the correct answers to as many puzzles as they can. The competition officially ends on the following Monday, at 23:59:59 (GMT +2 hours). No solutions submitted after the end of the competition will be accepted, even if the competitor started the round later than 22:29:59.
~40% of the round will consist of some selections from the 70 or so most commonly encountered “WPCstyle” puzzle types. These puzzle types are usually called “classics” or “evergreens” at the World Puzzle Championship. The puzzles are usually on a grid and require the solver to write information in the grid subject to given information and logical constraints. The rules for the puzzle types will be familiar to most WPC veteran competitors.
~30% will consist of puzzles that a competitor might encounter at a modern World Puzzle Championship (“WPCstyle”). The puzzles are usually on a grid and require the solver to write information in the grid subject to given information and logical constraints. They can often consist of new types or new variations, and may be harder than the puzzles comprising the remainder of the round.
It is expected that a round’s composition of puzzles will generally be enough to keep each class of solver occupied. Newer solvers may attempt to maximize their score by choosing the easiest puzzles, while top solvers of the world will have a chance at completing the set and will therefore be tested on more variety. For participants who are interested in knowing more about “WPCstyle” puzzle types, please consider purchasing our collections of past WPC sets, on the WPF Archive Page.
Only WPF solvers with a registered account on www.gp.worldpuzzle.org can participate. Registration is free, but you must provide a valid email address, name, and country.
Class A participants are those who qualify for at least one of the following conditions:
* For 2016, the Competitive Puzzles section will be considered, and for 2017, Division A will be considered.
Class B participants are those who qualify for at least one of the following conditions and do not qualify for any of the conditions for Class A:
* For 2016, the Competitive Puzzles section will be considered, and for 2017, Division A will be considered.
Class C participants are any participants who do not qualify for any of the conditions for Class A or Class B.
The participant’s score for the round is the sum of the point values of all puzzles with correct answers, with any adjustments as listed below:
Penalty Adjustment for Wrong Answers: For Divisions A and B, an incorrect answer scores the same as an answer left blank. In Division C, points may be taken away for incorrect answers to discourage guessing; such puzzles will be indicated as such.
Time Bonus for Finishing Early: All Division A and Division B puzzles, and most Division C puzzles, are eligible for time bonuses if the participant solves them before the end of the 60minute time period. When the participant believes that they have solved all (bonuseligible) puzzles in the Division, they may click on the “Claim Bonus” button. After clicking on the button, the participant may no longer submit any answers to (bonuseligible) puzzles.
Note that in Division C, some puzzles are not eligible for bonus. These may be puzzles that may require insight to solve, puzzles that might take some solvers without specific knowledge a very long time to solve, or puzzles that cannot be done quickly and methodically. Participants who think they might be claiming bonus may want to work on eligible puzzles first.
A participant’s qualifying score is the sum of their six highest scores (including any time bonus).
Each finalist will solve a total of 8 puzzles, with one type of puzzle chosen from each of the online rounds. The puzzles are designed to be of roughly equal difficulty, and the playoff is expected to last no longer than 50 minutes in total. Players who have higher playoffqualifying scores will receive a time advantage at the playoff, scaled such that the 1stplace solver would have a twominute advantage over the 10thplace solver.
There is no play off for Divisions B and C.
The details of the playoff rules are subject to change.