Download the new GHZ Demo here:
http://info.sonicretro.org/Sonic_1_Co...
This new build contains the following new fixes/features:
-There are now hub-areas, with their own hidden monitors (getting all of them will permanently color the hub stage). Before moving on to the next stage, on must at least get through both stages (Act's 1&3) of the Zone, before moving on to the next one.
-There is now an unlock-able extra act for each zone, unlocked and accessed by completing everything in the level.
-Invincibility Mappings are fixed.
-Robotnik only shows up in Act 3's if one of the monitors are found and takes 12 hits to defeat if you haven't found every Color Monitor for that stage.
-Two more Color Monitors are now implemented.
-Ending Music is low-def unless all color monitors in the game are found.