Comment by WorldMaker

All of Cyan's games were in Hypercard up to Myst. (Cosmic Osmo and Spelunx were the other two.)

Myst ran in Hypercard in early Mac releases but switched to a cross-platform runtime Broderbund built to sell Myst on Windows CDs (and consoles and more).

Riven was also majority designed/prototyped in Hypercard as a development platform, but more directly targeted from the beginning that same runtime Broderbund built for running Myst cross-platform.