Summary
How to enlarge empty map.
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How to fill the map with floor tile.
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| How to place a west / east door. |
Screenshots are presented by CSBuild 1.79. CSBuild is written by Paul R. Stevens.
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Launch CSBuild. I used CSBuild Version 1.79.

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At first, enlarge your level. Raise "Level Info".

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Click "Add Column" and "Add Row" to increase map size.

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My map is Width = 19, Height = 19.

1. Select "Open Cell".
2. Draw your map.
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Next, place closed doors.

1. Select "East/West Closed Door"
2. Place closed doors.
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