#3: Frogger | 20 Games Challenge

Will Jeremy the Frog and his friends manage to cross the street and get to the lilypads? This is the third game in the challenge, Frogger. I learned a ton with this one!

• Grid-based system
• Simple input buffer
• Refined object pooling system for cars, logs and turtles
• Procedural generation of nodes (logs, turtles, cars)
• Intricate net of signals to avoid direct calls as much as possible
• Collision layers and masks
• Collision overlaps check for the water kill box

Potential to expand with:

• Implementation of snakes, crocodiles, otters
• Additional levels of increasing difficulty

Known bugs:

• Sometimes grabbing a life fly makes the lives counter go out of bounds FIXED!
• Jeremy may slide off the end piece of moving logs and the water collision won't update

Assets: Kyle Fuji (his Frogger clone is way better than mine)

What is the 20 Games Challenge?

In early 2026, I found out about the 20 Games Challenge. It's a fun challenge designed by SDG Games to recreate 20 games in an engine of your choice. The premise of the challenge is that, by copying a masterpiece, artists often gain a deeper understanding of the fundamentals behind their craft. This can also apply to game developers and game designers.

I was sceptical at first, but as someone who's obsessed with figuring out how things work, this challenge had some huge appeal. So, in March 2026, I decided to give it a try: I'd attempt to recreate 20 famous games in about a year!

The 20 Games Challenge is fairly guided for the first 10 games, then free for the rest. Each level requires you to complete a set of steps in a vertical slice to consider it done. If you want to attempt it too, you can see options for the first 10 levels on this page.

My challenge list:

1. Pong
2. Jetpack Joyride
3. Frogger
4. Asteroids
5. Pac-Man
6. Super Mario Bros.
7. Worms
8. Crash Bandicoot
9. Doom
10. Portal ----- HALFWAY MILESTONE - FREE CHOICES FROM HERE -----
11. Minecraft
12. The Binding of Isaac
13. Lemmings
14. Guitar Hero
15. Metal Gear Solid
16. TBC
17. TBC
18. TBC
19. TBC
20. The Sims