🛰️ Crack the signal. Decode the alien sequence. A print-and-go A-Level sequences and series escape room for 11th Grade. Students work as a signal-analysis team racing to decrypt an alien transmission by solving four themed puzzles — arithmetic sequences, geometric sequences, convergence, and series sums. What's inside • 19-slide PowerPoint that drives the classroom — setup → puzzle → reveal rhythm for each of four clues, with the lock digits clicking into place on screen. • Three differentiated