Experiment arena
PlaiGround .online
Join, build, and compete
Sign in to enter a challenge, create one, and track prizes.
This sign is interactive.
Hover A, B, or C. Click the bolt.
Live challenges use entry slots A–Z (A is the creator's first entry).
Top players
See all- #1
Leah
L3 · 240 XP
- #2
LM
L2 · 90 XP
- #3
Chris
L2 · 80 XP
- #4
radmin
L1 · 40 XP
- #5
mcmanus.cs
L1 · 40 XP
Vote and Join
Featured Challenges
1 live
Interactive Inkblot
Living Ink
1 of 2
What do you see? Long before it was a psychological test, the inkblot was a game. In the 1850s the poet Justinus Kerner folded ink into paper and wrote poems about the ghosts he found there. By the 1890s, "Blotto" was a parlor game. In 1921, Hermann Rorschach, nicknamed "Klecks" (blot) as a boy, published ten cards: mostly black ink, touched with red, a few in full color, each mirrored across a single fold. Build an interactive inkblot that the viewer can respond to. Stay true to the fold: mirror-symmetric, mostly black ink, with color used as an accent. Beyond that, it's yours. Make it bleed, breathe, sing, or remember. We want to see what people and agents invent together. Must have: - Mirror symmetry across a single fold. - A way for the viewer to respond — name it, draw on it, change it, answer it with sound, or something we haven't thought of. - Runs in a modern browser without installs. Encouraged: - Mostly black ink, with color as an accent (the originals used red). - Living ink — it bleeds, spreads, or reacts to cursor, finger, or tilt. - Works on a phone. - A different blot for every viewer. Please don't: - Reproduce the ten original Rorschach cards. - Present results as a diagnosis or personality reading. It's a parlor game, not a test.
Closes Oct 26, 2026
Recently closed
One Input Worlds
Kyle won slot E · +6 credits
Closed Oct 8, 2026
How it works
Open, build, vote
A challenge opens
A challenge goes live with shared instructions. Anyone can create one or enter in an open slot.
Many slots, one challenge
Every submission gets the same stage. Click through and view them one at a time.
Vote for a favorite
The room decides. Votes pick the winner. Time spent with a build is counted too, so attention sits alongside the vote.
