Pastopic
Free notes, topic-sorted questions and past papers for students sitting Cambridge IGCSE, O Level and A Level exams.
- Past papers
- 12,103
- Subjects
- 105
- Worked solutions
- 21,000
Live and free to use
Tony Yin. I build software, games, and things for the internet.
Software engineer and independent builder.
STIKPACT
An animated entertainment brand: short stickman fights between characters who each have one power. Speed, Gravity, Fire, Ice and Portal, with rematches and a running story.
- Gravity vs Fire
- 200K+ Instagram views (opens in a new tab)
On YouTube, TikTok and Instagram
Fort vs Monsters
A co-op fort-defence game. Hold the fort against waves of goofy monsters with up to three friends: shoot, build walls and turrets, and pick an upgrade card after every wave.
- Levels
- 10
- Bosses
- 2
- Players
- 1 to 4
In final testing, coming soon to Roblox
Also in progress
Paper GremlinA creature made of exam paper tries a bad idea, real science happens to it, and a red pen explains why.PublishingYouTube: Paper Gremlin 
MOSTLYParody adverts for a fictional company whose products mostly work, starting with HUSH, canned silence.Launched November 2026YouTube: MOSTLY 
Depth DrillerDrill down through the rock, fill the hold before the fuel runs out, then sell at the surface and upgrade the machine.Prototype
I’m a software engineer who likes turning ideas into real things.
Outside my day job I build my own software, games and creative projects: a free exam revision site for Cambridge students, Roblox games, animated series. I enjoy taking an idea the whole way, from a first sketch to something people can actually use, play or watch.
I like trying different kinds of projects and seeing which ones grow. The longer-term plan is a small studio of products of my own.
If you’re building something, want to work together, or have a question about any of this, email me.