Location Danger Index is a numeral-based scale to determine how dangerous is the particular location relative to the specific journey.
The major differences between the legacy Flash version and the planned Lost Journey version are:
Due to its vastly rescaled player stats, the danger in the same locations differs significantly between the two versions. For instance, the Forgotten Forest in the Lost Journey version is far safer than the Bandits' Lair in the legacy Flash version, due to having much greater maximum HP in the Lost Journey when compared to the original Flash version (roughly double the maximum HP in this planned version).
It is definitely easy to defeat the Master Computer (formerly known as the Computer Guardian) to pass off the pre-expansion progress of the game without some legacy goal completions required to access the pivotal Great Boss of Earth in the Lost Journey version with the full pre-expansion completion score of 420 points, compared to the legacy Flash version, and also creates a notification on whether you need to get a 100% pre-expansion completion rate required to defeat the Great Boss of Earth (by talking to GIll in the Hidden Village). This is because the vastly improved player stats overall from the latter version significantly reduce the difficulty to defeat such boss without making the player die. For instance, before the first Rebirth, you will have a maximum of 204 HP at the time of defeating the Master Computer with that completion score required in this planned expansion as opposed to 99 HP in the original Flash version, just more than doubled between the two versions.
Overall, in the Lost Journey version, due to the complex danger index system in the expansion locations, this becomes increasingly difficult, especially late in the game.
0.00 = None
0.00 - 0.50 = Very low
0.50 - 1.00 = Low
1.00 - 2.00 = Medium
2.00 - 4.00 = High
Panselo: 0.00
Duri Forest: 0.50 (Forest); 0.75 (Ruins)
Sunflower Road: 0.75
Atai Bridge: 0.75
Atai City: 0.00
Atai City-Bandits' Lair Waterway: 1.50
Bandits' Lair: 1.25
Adar's House: 0.00 (Main House); 1.00 (Secret Area)
Misty Gorge: 1.00
Crossroads: 0.00 (in the normal state); 0.10 (with Slimes)
Daea: 0.00
Daea's Dungeon Hold: 1.50
Prince Tower: 1.75
Fran's Lab: 0.00
Thomas' Lab: 1.25 (Robot fight); 0.00 (elsewhere)
Farmer's Block: 0.00 (in the normal state); 0.05 (with a single Toad)
Great Walls: 0.00
Dread Lands: 2.00
Mul Caverns: 2.50
Ancient's Crater: 2.50
Phoenix's Lab: 3.00
Forgotten Forest: 3.50
Hidden Village: 0.00
World's Former End: 0.00 (opening area); 1.50 (southern pit with two Plant Dogs); 4.00 (during the Great Boss of Earth fight)