COMPLETE WORKS No.001-100

The 100-Day Challenge Dex.

From 2023.10.28 to 2024.2.4 I built something every single day and posted it on X. It started when I realised I could let ChatGPT write the annoying code and take it easy. My job was to complain that it didn't work. By the time I looked up, these 100 pieces were left over, and they turned themselves into a book, into research, and into a company.

Game ×60Tool ×33Board game ×5Card game ×2

ABOUT

What the 100-Day Challenge is

Build one piece of software every day, post it to X, and keep going for 100 days. I started as a fourth-year university student with no programming experience.

I built them with Pygame and tkinter. ChatGPT wrote the code; when it didn't run, I told it so and had it fix the code. Every day. Over the 100 days I used 8,123 prompts, kept 300 pages of notes, and worked roughly ten hours a day.

The record of those 100 days became the book #100 Day Challenge (Nikkei BP). Korean and Traditional Chinese editions are out too.

The 100 works break down into 60 games, 33 tools, 5 board games and 2 card games.

ARCHIVE

All 100 works

One a day, for 100 days. Look closely and you'll find things reused — that isn't laziness, that's systematisation.

Titles are shown in English with the original Japanese title underneath.

Day1 Othello screenshot

No.001

Othello

オセロ

Board game𝕏 ↗

Day2 Draw Poker screenshot

No.002

Draw Poker

ポーカー

Card game𝕏 ↗

Day3 Calculator screenshot

No.003

Calculator

電卓

Day4 Shogi screenshot

No.004

Shogi

将棋

Day5 Font Converter screenshot

No.005

Font Converter

フォント変換機

Day6 Catch Game screenshot

No.006

Catch Game

キャッチゲーム

Day7 File Translator screenshot

No.007

File Translator

ファイル翻訳

Day8 Space Invader screenshot

No.008

Space Invader

スペースインベーダー

Day9 Image Editor screenshot

No.009

Image Editor

画像編集ソフト

Day10 Air Hockey screenshot

No.010

Air Hockey

エアホッケー

Day11 Rating System screenshot

No.011

Rating System

レーティングシステム

Day12 Sudoku Generator screenshot

No.012

Sudoku Generator

数独自動生成

Board game𝕏 ↗

Day13 15 Puzzle screenshot

No.013

15 Puzzle

15パズル

Board game𝕏 ↗

Day14 Dummy Data Generator screenshot

No.014

Dummy Data Generator

ダミーデータ生成

Day15 Cannon Ball screenshot

No.015

Cannon Ball

砲弾

Day16 Translator Bot screenshot

No.016

Translator Bot

翻訳bot

Day17 Air Raid screenshot

No.017

Air Raid

空襲

Day18 Word Book screenshot

No.018

Word Book

単語帳

Day19 Fly the Plane screenshot

No.019

Fly the Plane

飛行機飛ばす

Day20 Welcome Bot screenshot

No.020

Welcome Bot

お迎えbot

Day21 Time Announcement Bot screenshot

No.021

Time Announcement Bot

時報bot

Day22 Fly the Plane 2D screenshot

No.022

Fly the Plane 2D

戦闘機を宙返りさせた

Day23 Breakout screenshot

No.023

Breakout

ブロック崩し

Day24 Shoot Down UFO screenshot

No.024

Shoot Down UFO

UFO撃墜

Day25 Draw Poker 2 screenshot

No.025

Draw Poker 2

ポーカー

Card game𝕏 ↗

Day26 Picture Puzzle screenshot

No.026

Picture Puzzle

絵パズル

Board game𝕏 ↗

Day27 Target Click Game screenshot

No.027

Target Click Game

ターゲットクリック

Day28 Evasion screenshot

No.028

Evasion

隕石の中散歩

Day29 Turn Simulation screenshot

No.029

Turn Simulation

ターン制ゲーム

Day30 Billiard screenshot

No.030

Billiard

ビリヤード

Day31 Invader Game screenshot

No.031

Invader Game

インベーダーゲーム

Day32 Maze screenshot

No.032

Maze

迷路

Day33 ChatGPT Bot screenshot

No.033

ChatGPT Bot

ChatGPT bot

Day34 Alarm Bot screenshot

No.034

Alarm Bot

アラームbot

Day35 Class Diagram Generator screenshot

No.035

Class Diagram Generator

クラス図自動生成

Day36 Concentration screenshot

No.036

Concentration

神経衰弱

Day37 Download Music from YT screenshot

No.037

Download Music from YT

YT音楽ダウンロード

Day38 Tap Game screenshot

No.038

Tap Game

タップゲーム

Day39 Whack-a-Mole screenshot

No.039

Whack-a-Mole

モグラたたき

Day40 Ghost Buster screenshot

No.040

Ghost Buster

ゴーストと戦ってみた

Day41 File Manager screenshot

No.041

File Manager

ファイル管理ソフト

Day42 Brain Training Game screenshot

No.042

Brain Training Game

脳トレゲーム

Day43 Falling Block Puzzle screenshot

No.043

Falling Block Puzzle

カプセル落ちものパズル

Day44 Dog Fight screenshot

No.044

Dog Fight

ドッグファイト

Day45 Typing Game screenshot

No.045

Typing Game

タイピングゲーム

Day46 Minesweeper screenshot

No.046

Minesweeper

マインスイーパー

Day47 Product Manager screenshot

No.047

Product Manager

物品管理アプリ

Day48 Dice Gamble screenshot

No.048

Dice Gamble

サイコロギャンブル

Board game𝕏 ↗

Day49 VoiceVox screenshot

No.049

VoiceVox

VoiceVox読み上げ

Day50 Othello screenshot

No.050

Othello

オセロ

Day51 Catch Fruits screenshot

No.051

Catch Fruits

フルーツキャッチ

Day52 Darts screenshot

No.052

Darts

ダーツ

Day53 Mega Solar Business screenshot

No.053

Mega Solar Business

ソーラー経営

Day54 Binary Simulation screenshot

No.054

Binary Simulation

バイナリーシミュレーション

Day55 Omikuji screenshot

No.055

Omikuji

おみくじ

Day56 Decode screenshot

No.056

Decode

暗号解読

Day57 Text Adventure screenshot

No.057

Text Adventure

テキストアドベンチャー

Day58 Look That Way screenshot

No.058

Look That Way

あっち向いてホイ

Day59 Word Chain screenshot

No.059

Word Chain

しりとり

Day60 Inventory Ledger screenshot

No.060

Inventory Ledger

商品有高帳

Day61 Cash Book screenshot

No.061

Cash Book

現金出納帳

Day62 Financial Statements screenshot

No.062

Financial Statements

財務諸表

Day63 Number Guessing screenshot

No.063

Number Guessing

ハッキングゲーム

Day64 Shooting Gallery screenshot

No.064

Shooting Gallery

射的ゲーム

Day65 Word Guessing screenshot

No.065

Word Guessing

単語当てゲーム

Day66 Make 10 screenshot

No.066

Make 10

メイク10

Day67 Chat Bot screenshot

No.067

Chat Bot

チャットボット

Day68 Quiz Game screenshot

No.068

Quiz Game

クイズゲーム

Day69 Sudoku screenshot

No.069

Sudoku

ナンプレ

Day70 Diagram Classification screenshot

No.070

Diagram Classification

図形仕分けゲーム

Day71 Russian Roulette screenshot

No.071

Russian Roulette

ロシアンルーレット

Day72 Graph Drawer screenshot

No.072

Graph Drawer

グラフ描画ソフト

Day73 Wordle screenshot

No.073

Wordle

Wordle

Day74 Pygame Excel screenshot

No.074

Pygame Excel

Pygame×Excel

Day75 Shift Scheduler screenshot

No.075

Shift Scheduler

シフトスケジューラー

Day76 Hundred-Square Calc screenshot

No.076

Hundred-Square Calc

100マス計算

Day77 Temperature Graph screenshot

No.077

Temperature Graph

気温グラフ化

Day78 Web Form screenshot

No.078

Web Form

Webフォーム

Day79 Weather Forecast screenshot

No.079

Weather Forecast

天気予報

Day80 Run Game screenshot

No.080

Run Game

ランゲーム

Day81 Drawer Software screenshot

No.081

Drawer Software

お絵描きソフト

Day82 One-Stroke Sketch screenshot

No.082

One-Stroke Sketch

一筆書きゲーム

Day83 2048 screenshot

No.083

2048

2048

Day84 JAN Code Scraper screenshot

No.084

JAN Code Scraper

JANコードスクレイパー

Day85 Langton's Ant screenshot

No.085

Langton's Ant

ラングトンのアリ

Day86 Website screenshot

No.086

Website

Webサイト

Day87 Stopwatch Game screenshot

No.087

Stopwatch Game

ストップウォッチ

Day88 Fractal Tree screenshot

No.088

Fractal Tree

フラクタルの木

Day89 Koch Snowflake screenshot

No.089

Koch Snowflake

雪

Day90 Beanbag Toss screenshot

No.090

Beanbag Toss

玉入れ

Day91 Map Editor screenshot

No.091

Map Editor

マップエディタ

Day92 Bombing screenshot

No.092

Bombing

爆撃

Day93 Jigsaw Puzzle screenshot

No.093

Jigsaw Puzzle

ジグソーパズル

Day94 Circle Area Animation screenshot

No.094

Circle Area Animation

円の面積アニメーション

Day95 Tower of Hanoi screenshot

No.095

Tower of Hanoi

ハノイの塔

Day96 Lunar Lander screenshot

No.096

Lunar Lander

ルナランダー

Day97 Chess screenshot

No.097

Chess

チェス

Day98 Tetris screenshot

No.098

Tetris

テトリス

Day99 Puyopuyo screenshot

No.099

Puyopuyo

ぷよぷよ

Day100 Othello screenshot

No.100

Othello

オセロ

NEXT

What comes after this Dex

The long version

Everything long — including what happened after the 100 days — is written on note. (Japanese)

Read on note ▶BOOK

“#100 Day Challenge”

Nikkei BP turned how those 100 days ended into a bestseller.

Book details ▶