Tusari 2 - The River

Tusari 2 The river level packaged into a small self contained game. For the Commodore 64.

• Shoot the ghosts.
• Collect the crystals.

I thought I would spend a couple of days making the technical demo into a proper game. The download is free, but if you appreciate the game and/or the source code a small donation is always great. :)

Score and status at the bottom of the screen

• The heart shows remaining health.
• The two yellow dots are your smartbombs.

Controls

• Joystick port 2 - Up/down/left/right and fire
• Space - Launch a smartbomb. You start the game with two.

Technicals

Very unusual for a game, but this has source code released. I like to open source what I work on: https://github.com/martinpiper/C64Public/tree/master/Tusari2/FLDParalax

It's the first C64 game to use vertical parallax and horizontal parallax with variable speed while using simultaneous raster synchronised NMI and IRQ interrupts for the scroll and sprites. It's also, I think, the first game to use a new technique called Sprite Shift-Plexing which is used for the bullets and the smartbomb effect. All of the bullets on screen only use one sprite, but it is shifted horizontally so each sprite can contain up to three bullets and then the same sprite is also moved vertically to fill the screen.