---
title: "Fifteen Puzzle — 4K/2K"
type: "article"
slug: "fifteen-puzzle-4k-2k"
url: "http://localhost/article/fifteen-puzzle-4k-2k/"
markdown_url: "http://localhost/article/fifteen-puzzle-4k-2k.md"
published_at: "2026-03-13T00:34:06+00:00"
modified_at: "2026-03-13T00:34:07+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Implementation of the classic 15-piece sliding puzzle game for the ZX80 in 4K ROM with 1K+ RAM. Checks for solvable starting combinations (not all 20 trillion are), prevents illegal moves, counts moves, and congratulates the player on winning. Includes complete BASIC listing."
category:
  - name: "Syntax"
    slug: "syntax"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/syntax/"
post_tag:
  - name: "BASIC (programming language)"
    slug: "basic-programming-language"
    taxonomy: "post_tag"
    url: "http://localhost/tag/basic-programming-language/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
  - name: "ZX80"
    slug: "zx80"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx80/"
model:
  - name: "Sinclair ZX80"
    slug: "zx80"
    taxonomy: "model"
    url: "http://localhost/model/zx80/"
indiv:
  - name: "Bill Eckel"
    slug: "bill-eckel"
    taxonomy: "indiv"
    url: "http://localhost/indiv/bill-eckel/"
genre:
  - name: "Game"
    slug: "game"
    taxonomy: "genre"
    url: "http://localhost/type/game/"
publication_r:
  id: 10246
  title: "Syntax"
  type: "periodical"
  url: "http://localhost/periodical/syntax/"
authors_r:
  - name: "Bill Eckel"
    slug: "bill-eckel"
    taxonomy: "indiv"
    url: "http://localhost/indiv/bill-eckel/"
volume: "3"
issue: "4"
issues_articles:
  - id: 52478
    title: "Syntax/Syntax ZX80 v3 n4"
    type: "issue"
    url: "http://localhost/issue/syntax-syntax-zx80-v3-n4/"
pages: "5"
pubdate: "April 1982"
archive_link: false
---

# Fifteen Puzzle — 4K/2K

Implementation of the classic 15-piece sliding puzzle game for the ZX80 in 4K ROM with 1K+ RAM. Checks for solvable starting combinations (not all 20 trillion are), prevents illegal moves, counts moves, and congratulates the player on winning. Includes complete BASIC listing.