In primarilly unofficial sources the game is sometimes called Protmūšis (literally meaning Mindbattle).
Traditionally in every match of Protmušis two teams play against each other. At any given moment no less than three and not more than five people could play for a single team (although it is permitted to register up to eight team members in which case different team members could play at different matches). During the match ten pre-prepared questions are shown on the large screen in the front of the hall (the questions are of such a style that in order to answer them one needs both general knowledge and the ability to think logically). After the host reads each question, the one-minute timer is started. During that one minute players are permitted to discuss the possible answers with the fellow members of their team and to think. Once one of the teams believes that it already knows the correct answer, the team presses a button to stop the timer and calls out the answer. If the host and/or the referee accepts the answer as correct, the full answer is shown on the screen and the team is awarded a point. If not, the one-minute timer is restarted and the other team is permitted to continue searching for the answer and to tell their attempt to answer the question. The team that has more points after all ten questions are read is declared the winner. If both teams have an equal amount of points at that time, the match ends in a draw. A draw is only possible in the regular season; if such a situation occurs during the playoffs, an overtime is played: additional questions are presented to the teams until the first correct answer is given - at that point the team which answered correctly is declared to be the winner.
In the semi-finals 12 questions are presented in each game rather than 10. In the finals there are 15 questions.
In various unofficial matches of Protmušis the rules may differ slightly.
Every year two championships (seasons) are held, each one lasting for approximately four months (one in the winter and spring and one in the autumn and winter; the seasons are separated by the winter and summer holidays and the student exams).
Each season consists of the regular season and the playoffs. In the regular season all the participating teams are put into groups. All teams in the same group has to play against each other. During these games, the winning team is given two points, and both teams are given one point each for a draw. The number of groups and the number of teams in each group as well as the number of teams advancing to playoffs depend on how many teams participate in Protmušis that particular season, therefore, the system varies somewhat from season to season. In some seasons some matches are played by three teams rather than two.
In addition to the main championship, various smaller games are being held: when neither of the playing teams answer the question correctly the spectators of Protmušis are permitted to give a try (the spectators who answered the most questions are being listed in the official website), the best questions are voted for and the spectators and players who had created the most questions are named, all the players and spectators are asked additional questions where it is possible to win special prizes.
At present Protmušis is held each Wednesday at 18:30 (Vilnius time) in the great hall of the Faculty of the Natural Sciences of Vilnius University. Anybody (including non-players and non-students) is permitted to come and watch the games, try their luck in answering the questions that teams are unable to answer or to support the teams of their faculty or institute. Each Wednesday four matches are played (whole event of four matches lasts for approximately two hours). All the questions and answers during the game are presented in the Lithuanian language.
The questions that are presented in the Protmušis games requires both general knowledge and the ability to think logically. They might be related to various fields (such as history, geography, arts, physics, biology and so on), but may not require a very specific knowledge in those fields. Usually, the questions are about more or less minor topics that are not known to most people, but after thinking logically it is possible to guess the answer based on one's general knowledge about various similar more important subjects. The goal of a good Protmušis question is to make it so that nobody would answer it immediately, but the team members would need to discuss among themselves and only after each member said his/her suggestions or thoughts regarding the question it would be possible to find the best answer. The amount of questions that are answered correctly by the teams per each match varies greatly (from 10% when the weaker teams play to 90% when the major teams face each other), but usually the teams are able to find the correct answer for approximately 50%-60% of the questions.
Each question as is shown on the screen consists of two slides, one for question and one for answer. The question slide usually includes introduction that is meant both to help find out the answer to the question and to describe the subject more, and the question itself. The answer slide includes a detailed explanation of the answer. The goal of Protmušis is not only to entertain but to expand the knowledge of the players and the spectators as well, therefore, the questions that are related to interesting subjects that are not widely known to the general public, but are worth to be known, are especially valued. Both the question slide and the answer slide are usually illustrated with pictures related to the subject.
Everybody (both players and spectators) is permitted to send in the questions for Protmušis (the questions are not presented during the matches of the team of the player who had created the question).
Protmušis was organised for the first time in 1997. It is organized regularly, two seasons a year, since 2003. Over the time Protmušis have expanded and improved greatly. The number of participating teams increased and so did the number of universities and faculties represented. The technology have improved (for example, special buttons are now used by the teams to express their will to attempt answer the question; prior to the fifth season lamps were used instead and in the 1997 it was simple hand raising), the number of organisers and the question authors have increased. Protmušis found many sponsors (such as Vaga, one of the biggest publishing houses in Lithuania) and therefore prizes are given now. The official internet website and forums were established and had improved, Protmušis was featured many times in the student press. In the autumn of 2006, Protmušis was also featured in the Sostinė supplement of the leading Lithuanian newspaper Lietuvos Rytas and on the Lithuanian national television (LRT). In the spring of 2006 the cooperation of Protmušis and the International Quizzing Association started and the Lithuanian branch of the World Quizzing Championships 2006 was organised using the organisational basis of Protmušis. In December 2006 during the European Quizzing Championships in Paris, a demonstration of Protmušis was given, introducing the gameplay to other European nations.
In the second season (autumn of 2003) 10 teams participated, all players were students of the Faculty of Natural Sciences of Vilnius University or the Faculty of Chemistry of Vilnius University.
In the third season (spring of 2004) 16 teams participated, representing various faculties of Vilnius University.
In the fourth season (autumn of 2004) 15 teams participated.
In the fifth season (spring of 2005) 21 team participated, with some players being students of other universities than Vilnius University for the first time.
In the sixth season (autumn of 2005) 22 teams participated.
In the seventh season (spring of 2006) 26 teams (representing all the Vilnius-based faculties of Vilnius University and some faculties of the other universities of Vilnius) expressed their will to participate. Due to such a large number of teams the qualification matches had to be organised. After the preliminary games, 20 teams won the right to participate in the main tournament.
In the eight season (autumn of 2006) 28 teams participated.
In the ninth season (spring of 2007) 35 teams participated, with universities that are based not in Vilnius represented for the first time.
In the tenth season (autumn of 2007) 24 teams participated.
In the eleventh season (spring of 2008) 27 teams participated.
In addition to the official championships, unofficial matches and mini-tournaments have been held. These included demonstration games and special games (that have been organised as a part of some bigger scientific, educational or entertainment events). The rules and questions might differ slightly during unofficial matches (for example, in matches that are organised as a part of some event the questions might all be set in accordance to the topic of the event).
As of now, each team may consist of five to eight players (no more than five players could play for the team in a match at any given time however). Some teams are participating for many years (there are players who have participated in every season since 1997). Each season at least several new teams registers for participation. Many teams represent some particular faculty or institute, while other teams are mixed.