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This game provides an opportunity to practise a lot of transformations in the context of a game. The scoring system encourages the use of combinations of transformations. Opponents usually watch for cheating and errors, so there is built-in feedback for students. The structure of a game encourages students to play strategically.
Play a demonstration game, teacher vs a couple of students working together. It would be useful to have the playing board drawn or projected on the board for this. Ask students to play in pairs to get used to the game, and to make a note of any questions they might have.
With the class all together, allow time to answer the questions that have arisen.
Explain that students will be playing in pairs against other pairs, and that they will have some time to prepare. In their pairs, suggest that students ensure they know where the triangles would go, for whatever transformation card they get, and encourage them to practise making more complex transformations.
Organise a competition between pairs.
Use the time available to give positive feedback to those who get high total scores (even if they do not win) and to those who use combined transformations.
Where can we get to from here?
How would you get to the high scoring triangles? Which cards would you need to have?
Students might want to redesign some of the transformation instruction cards, so that the information about how to move is clearer to them. The teacher will need to decide whether they should use their own cards, or whether they could keep them visible as a reference to check the meaning of the printed cards.
Explain that the group will be playing this game in teams against the teacher later on, and that they have most of the lesson to work on strategy. Maybe kids could start with a couple of cards, then come and ask for more when they are sure that they know where each triangle would go, and then two more etc.
When a team plays the teacher, make sure that they discuss and agree on the moves.
Students could be restricted to moves which involve more than one transformation.
Other aspects could be altered - students could agree fair rules between themselves.
Ask students to design their own version of the game, perhaps changing the shape, the transformations on the cards and the size of the grid. They could play the game to decide what scores are appropriate for their new version.