Fifteen

Fifteen Puzzle is a sliding puzzle on a 4x4 board with fifteen

numbered pieces and one empty space. The pieces are scattered,

and the object is to put them in numeric order with a series of

moves through the vacant space. The idea dates back to around

1880, and is credited to Noyes Chapman. More information here:

https://en.wikipedia.org/wiki/15_puzzle

Getting Started

Following reset, the title screen is shown until you press any

key on keyboard A to begin. The Studio II then generates a new

puzzle, showing its status with a progress bar. Play can start

after the board is displayed. Press reset for a new game.

Moving Pieces

This game uses keyboard A only. Direction keys 2, 4, 6, and 8

move the cursor, shown as a white square. Place it on top of

the piece you want to move, and then press key 5 to slide the

highlighted piece into the empty space. Only pieces that are

horizontally or vertically adjacent to the empty space can be

moved, diagonal moves are not allowed.

Winning

Although the traditional puzzle has multiple solutions, this

version recognizes just one. You win if you can arrange the

pieces in ascending order, left to right and top to bottom, the

empty space at the bottom right (see figure 4). Note that hex

digits A-F are used for numbers 10-15. If you can accomplish

this a series of beeps will play and the game ends.

Press 'Clear' and then any key. Controls are '2', '4', '6', '8' (movement), '5' (slide)