Chapter 1 · Tools of Geometry, as a detective lab. Eight cases, one for each lesson: nets and views, points, lines and planes, segments, angles, angle pairs, constructions, midpoint and distance, and perimeter and area.
Each case runs one screen at a time: the mystery, the key words, a hands-on investigation, a prediction, worked examples where every step changes the picture, then explaining, comparing, finding the error and practice with three hints. Then try the Quest levels, the Mastery quiz and the final mystery, The Missing Blueprint.
Reference book: Pearson Geometry, Chapter 1 (pp. 1–75). The examples are new problems modelled on each book Problem, with new numbers and settings; each card names the Problem and page it follows.