My First Paid Game Dev: Code Walkthrough of Frogs And Flies on the Commodore 64

Today we'll take an in-depth look at the first commercial(ish) game I made, Frogs and Flies for the Commodore 64, published by Loadstar in 1997. I play the game, explain some of the history/story behind it, and then do a full walkthrough of my 24-year-old code!

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BCD episode: https://youtu.be/vnhyGt6URYc
Music playback episode: https://youtu.be/EZAcD8aXVm4

End credits music is "64738" by Bedford Level Experiment: https://youtu.be/KcI68ww76ds

Index
0:00 Selling my first game
1:47 Assembling the game
2:58 Credits, Loadstar agreement, more game info
6:41 Playing the game
11:01 Looking through the source
12:58 The labels / memory layout
16:49 Game initialization
18:26 Play initialization
24:06 Main loop
26:58 Game over
29:37 Fly logic
40:02 Sprite collision
42:40 Scoring, sprite setup
44:36 Part Two: the Advanced/Beginner options
47:33 Continuing with code: frog1's variables
51:10 Frog timeout
53:30 Frog state machine: idle to start jump
59:30 Splashing, swimming
1:03:02 Jumping, landing
1:08:09 Updating the frog position, wall collision
1:09:54 The tongue!
1:15:54 The 12.4 to 9 bit conversion
1:16:49 Routines: Screen clear, BCD score, Game init
1:20:20 Brain: Frog "AI"
1:23:04 Title screen
1:27:00 Game timer, day/night
1:28:35 Copy + paste time!
1:31:30 Wrap-up and thanks

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