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_ _ __ ___ | | (_) / / / __| | | _ / /_ | /__ | | | | | _ \ |___ \ | |_ | | | (_) | .___) | \__|_| | \___/ \___/ |__/ LJ65 an NES game by Damian Yerrick See the legal section below. _____________________________________________________________________ Introduction LJ65 is an action puzzle game for NES comparable to the popular game Tetris(R), except distributed as free software and with more responsive movement controls. _____________________________________________________________________ Installing LJ65 is designed to run on Nintendo Entertainment System (called Family Computer in Japan) and accurate NES emulators. It is distributed as source code and an iNES format binary, using mapper 0 (NROM). Separate binaries for NTSC and PAL systems are provided. This program has been tested on NES using a PowerPak. It also works on the current versions of Nintendulator, Nestopia, and FCE Ultra. (Do not use the outdated Nesticle emulator anymore.) To run LJ65 on an NES without buying a PowerPak, you'll need to solder together an NES cartridge with at least 16 KB of PRG space and 4 KB of CHR space. A modded NROM-128 or CNROM board should be fine. Chris Covell has put together instructions on how to replace NES Game Paks' mask ROM chips with writable EEPROMs. http://www.zyx.com/chrisc/solarwarscart.html To build LJ65 from source code, you will need * CC65 (from http://www.cc65.org/ but you don't need the non-free C compiler) * GNU Make and Coreutils (included with most Linux distributions; Windows users can use MSYS from http://www.devkitpro.org/) Modify the makefile to point to where you have CC65 installed. Then run make. (Windows users can run mk.bat instead, which runs make in the correct folder.) On a desktop PC from late 2000 with a Pentium III 866 MHz, recompiling the whole thing takes about one second. To build some data conversion tools, you'll need a GNU C compiler such as MinGW; I have included Windows binaries of the conversion tools for those who want to quickly get into hacking on LJ65. _____________________________________________________________________ Game controls Title screen: Start: Show playfields. Game over: A+B: Join game. Menu: Control Pad up, down: Move cursor. Control Pad left, right: Change option at cursor. A: Start game. Game: Control Pad left, right, down: Move piece. Control Pad up: Move piece to floor. Control Pad up, down once landed: Lock piece into place. A: Rotate piece clockwise. B: Rotate piece anticlockwise. Start: Pause game. _____________________________________________________________________ Play At first, press Start to skip past each of the informational screens. Then press Start at the title screen to display the playfields. At this point, either player can press the A and B buttons at the same time to begin playing. The pieces in LJ65 are called tetrominoes. (The word comes from tetra-, a Greek prefix meaning four, and -omino, as in domino or pentomino.) Each of the seven tetrominoes is made of four square blocks and named after a letter of the Latin alphabet that it resembles: _ _ ___ ___ _ ___ _______ | |___ ___| | | | _| _| _| |_ |_ |_ |_______| |_____| |_____| |___| |___| |_____| |___| I J L O S T Z When you start the game, a tetromino will begin to fall slowly into the bin. You can move it with the Control Pad and rotate it with the A or B button. The goal of LJ65 is to make complete horizontal lines by packing the pieces into the bin with no holes. If you complete a line, everything above it will move down a row. If you complete more than one line with a piece, you get more points. As you play, the pieces will gradually fall faster, making the game more difficult. At some point, the pieces will fall so fast that they appear immediately at the bottom row of the playfield. If you fill the bin to the top, to the point where more pieces cannot enter, you "top out" and the game ends. If you have an overhang in the blocks, you can slide another piece under it by holding Left or Right as the new piece passes by the overhang: _ | | _| | |___| _ _ _ _ _ _| | => _| | | | => _| | | | _| | _|_| | | _| | |_| |_| |___| |_|___| Or in some cases, you can rotate pieces into very tight spaces: _ _| | |_ | |_| _ ___ _ _ ___ _ ___ | | |_ | => | |_| |_ | => | |___|_ | | |_ _| | | |_ |_| | | |_ _| | |___| |___| |___|_|___| |___|_|___| _____________________________________________________________________ Rotation systems LJ65 supports two rotation systems, which it calls "Center" and "Bottom". Center implements rules more familiar to Western players, while Bottom pleases fans of the Japanese arcade tradition. In Center, pieces start out with their flat side down, and they rotate around the center of an imaginary 3x3 or 4x4 cell bounding box. If this is blocked, try one square to the right, one square to the left, and finally one square up. Up locks a piece into place immediately, and down waits for another press of up or down before locking the piece. After a piece locks, the next one comes out immediately, but after the pieces have sped up enough, the next piece waits a bit. Colors match the so-called Guideline: I is turquoise. . []. . []. . . . . []. . [][] . []. . . . []. . [][][] . [][] [][][] [][]. [][]. . [][] . [][] [][]. . . . . []. . []. . []. . . . . . [] [][]. . []. Figure: T and S rotation in Center In Bottom, the J, L, S, T, and Z pieces start out with their flat side up, and they rotate to stay in contact with the bottom of an imaginary 3x3 cell box. S and Z pieces also keep a block in the bottom center of this box. If this is blocked by a wall or a block outside the piece's central column, then try one square to the right, one square to the left, and finally (in the case of T) one square up. Down locks on contact, and up waits for another press of up or down to lock. After a piece locks, the next one waits a bit to come out. Colors match those from a game with a monkey: I is red. . . . . []. . . . . []. . . . []. . . . . []. . [][][] [][]. . []. . [][] . [][] [][]. . [][] [][]. . []. . []. [][][] . []. [][]. . []. [][]. . []. Figure: T and S rotation in Bottom _____________________________________________________________________ Scoring Use up or down on the Control Pad to drop pieces, and you'll get one point per row that the piece moves down. You also get points for clearing lines. Clearing more lines with a single piece is worth more points: SINGLE (1 line with any piece) 1 * 1 * 100 = 100 points DOUBLE (2 lines with any piece) 2 * 2 * 100 = 400 points TRIPLE (3 lines with I, J, or L) 3 * 3 * 100 = 900 points HOME RUN (4 lines with I only) 4 * 4 * 100 = 1600 points Making lines with consecutive pieces is called a combo and is worth even more points. In general, the score for a line clear is the number of lines cleared with this piece, times the number of lines cleared so far in this combo, times 100. For example, a double-triple-single combo is worth a total of 2300 points: 2 lines 2 * 2 * 100 = 200 points 3 lines 3 * 5 * 100 = 1500 points 1 line 1 * 6 * 100 = 600 points When you start clearing lines, the game shows how many lines you made in this combo. If you leave a 2-block-wide hole at the side of the bin, you might manage to make a combo of 12 lines or more. But then you have to weigh this against keeping your stack low and earning more drop bonus. There are some grandmasters who can get millions of points in some puzzle games. There exists a known corner case in this game's score computation, and scoring is expec