courses/algebra-pyret/lessons/coordinates/pages/Estimation.pdf courses/algebra-pyret/lessons/coordinates/pages/BrainstormGame.pdf courses/algebra-pyret/lessons/numbers-inside-video-games/pages/notes-intro.pdf courses/algebra-pyret/lessons/numbers-inside-video-games/pages/NoticeAndWonder.pdf courses/algebra-pyret/lessons/numbers-inside-video-games/pages/ReverseEngineerGame.pdf