The Alphabet Tower
This puzzle included an interactive component, the details of which appear below.
From 1845's Architectural Hunt. Please send 2 people who are good at building things according to rules to Twenty Chimneys at 9 AM Saturday.
When teams had arrived at Twenty Chimneys, they were given an envelope. When all teams had arrived, they were told to open their envelopes. Inside they found this set of instructions:
They also found a starting set of cards, of which the following is typical:
A complete set of Building Rules and Scoring Rules, which teams would discover during the course of the event by trading cards with other teams, can be downloaded here: