Inform 7 Handbook (A4 size)

"Hooray! The Inform 7 Handbook is now at version 2.0. This newly expanded edition of Handbook has been updated from start to finish for compatibility with Inform 7 version 6L38. It has chapters on creating rooms and scenery, on handling objects, on adding actions, on creating characters, on puzzle design, and so forth. There's a lot of other useful stuff too. The Handbook is packed with code examples, and has a glossary with cross-links to the rest of the text. It's also extensively cross-referenced to Writing with Inform." https://www.musicwords.net/if/i7hb.htm