Above the Summits - Logic Grid Puzzle

Clues
Answer

1. The explorer who needed 10 days to climb a mountain was either the explorer who climbed Everest or the explorer who climbed in 1970.
2. The 1970 climbing took longer than the 1990 climbing.
3. Of the explorer Ludwig and the explorer Otto, one climbed in 1990 and the other climbed Kilimanjaro.
4. Aconcagua needed 5 more days to be climbed than the mountain climbed in 1970.
5. The mountain climbed in 1980 needed 5 more days to be climbed than the mountain climbed by Otto.
6. Everest was either climbed by Edmund or climbed in 1980.
7. The mountain climbed in 1990 needed 5 fewer days than the mountain climbed by Edmund.

1. The explorer who needed 10 days to climb a mountain was either the explorer who climbed Everest or the explorer who climbed in 1970.
2. The 1970 climbing took longer than the 1990 climbing.
3. Of the explorer Ludwig and the explorer Otto, one climbed in 1990 and the other climbed Kilimanjaro.
4. Aconcagua needed 5 more days to be climbed than the mountain climbed in 1970.
5. The mountain climbed in 1980 needed 5 more days to be climbed than the mountain climbed by Otto.
6. Everest was either climbed by Edmund or climbed in 1980.
7. The mountain climbed in 1990 needed 5 fewer days than the mountain climbed by Edmund.

Observation: This table is automatically filled accordingly to the grid.

How to play

Start by reading all the clues;
Find the most basic clues and use the grid to mark them on it;
Use logic deduction to find propositions that are not explicit;
Click on a clue to mark it as used;
The answer table is filled automatically.

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Need help?

If, after reading the instructions, you still don't understand how to play, try playing one of these simpler logic grids puzzles. They are "very very easy".