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+# Overview
+
+* Q1: An Art of Computer Programming
+* Q2: The False Awakens
+* Q3:
+    * La
+    * ra
+    * ve
+    * l
+* Q4: Quadrilingual PHPer
+* Q5: Are You a Coffee Pot?
+
+Note that they may not work on Windows.
+
+
+# License
+
+MIT
+
+
+# Acknowledgement
+
+Q5 is inspired by https://github.com/tric/trick2022/tree/master/02-tompng by tompng.
+
+
+# Do you want more hints?
+
+*!!SPOILER!!*
+
+## Q1
+
+<details>
+<summary>What is "password?"</summary>
+It starts with `i` and ends with `g`. PHPerKaigi system is case-insensitive but the Q1 program does *not* accept uppercase.
+</details>
+
+## Q2
+
+<details>
+<summary>Which "false" should I replace?</summary>
+Write a small script for brute <del>false</del> force.
+</details>
+
+## Q3
+
+<details>
+<summary>It does not work for me.</summary>
+The Q3 program highly depends on PHP internals. If it does not work, read the source code to find the token.
+</details>
+
+## Q4
+
+<details>
+<summary>How can I get correct keys?</summary>
+First, install PHP, Ruby, Perl and Bash interpreter. Second, run the Q4 program on each interpreter.
+</details>
+
+## Q5
+
+<details>
+<summary>Where is token?</summary>
+Look at the bottom of the teapot.
+</details>
+
+<details>
+<summary>Too slow!</summary>
+Enable fast mode by changing `FAST_MODE` constant.
+</details>