Web technologies come and go. In 2010 you could play Leadlight in browser-based Apple IIe and Apple IIGS emulators. Then, for a long time, you couldn't. A new browser-based Apple II emulator called Apple2TS has come onto the scene, and I've used it to make Leadlight playable in web browsers anew, this time via an emulated Apple IIe. The emulator includes save state functionality. The save files are kept on your own computer and you decide where to put them. You can launch the game in Apple2Ts from
Leadlight's Apple II page on the Leadlight Gamma website