The Shareware version of Eagle Lander 3D (EL3D) has a fixed mission/scenario. It includes the last minutes of manual flight of the Apollo 11 landing. All of the basic features of EL3D are available: multiple views, EVA, scoring, graphics options, Replay (playback only), etc.
For about the price of a tank of gas (maybe less if you live in California or Europe) you can experience the full breadth of EL3D.
Multiple missions and scenarios. Missions 12,15, LM Racing and Orbital modules become available. Any plug-in mission will work and as more are added the amount of missions and scenarios will grow.
Longer Flights. The unregistered flight is a short flight from low altitude. The registered version includes a longer landing flight from about 8000' as well as indefinite flight in the Orbital mode. The longer flight demonstrates the Landing Point Designator (LPD) and special computer operation for redesignating the landing spot.
Saving Replays The Shareware version of EL3D allows loading and playing of replays. Registration allows the ability to save replays.
Parameter changes. Each mission has a .sit file that contains customizable parameters such as startup fuel, locations, speeds, altitudes, etc.