Professor Oops: Messy Drawing

Draw a masterpiece. Then squirt ketchup on it. On this paper, that's allowed.

Professor Oops is a drawing app for kids of about 4 to 10, with real science experiments for kids. No ads, no accounts, works offline. Draw, paint or make your own coloring page, then squirt ketchup on it: the paper really reacts. Roll a tennis ball through the ketchup or drive a toy car through the paint (full toolbox), and the tracks become your picture. All the mess, none of the clean-up.

PAINTING FOR KIDS THAT ACTS REAL
• Watercolors that bleed, blend and dry with soft edges
• A paint board for mixing your own colors
• Crayons, colored pencils and markers: perfect for coloring, doodling and drawing
• A drawing kit: stencils, a ruler, a compass and spiral gears

DRAW WITH ANYTHING
Everything reacts, so every thing leaves its own marks:
• A line of honey or ketchup, straight from the squeeze bottle
• A face plant: Auntie's lipstick kiss, printed in the paint
• A rolling pin that rolls the paint out again
• An egg cracked on your drawing, a loaf baked right on it
• With the full toolbox: tennis ball tracks, tire tracks, the cat's and the puppy's paw prints

MAKE A MESS IN THE KITCHEN
Squeeze ketchup, mustard and honey. Drop ice cream, eggs, fruit and chocolate and shake on sprinkles. Or bake for real: knead dough, let it rise with yeast and bake a golden loaf.

SCIENCE EXPERIMENTS FOR KIDS: REAL KITCHEN SCIENCE
• Red cabbage juice as a pH indicator: pink with vinegar, blue-green with baking soda
• Magic milk: one drop of dish soap and the food coloring swirls
• Oil floats on water, but beaten into egg yolk it makes mayonnaise
• Paper chromatography: water splits black ink into colors
• Fizzing vinegar and baking soda, plus salt painting with glue and watercolor
• Secret lemon-juice or milk ink that appears when you heat it
• A cola-and-mints geyser and elephant toothpaste

SAFETY LESSONS THAT STICK
Why you never mix bleach and vinegar: on the screen the room fills with chlorine gas, so you open the window and get out into fresh air. Water makes burning oil flare up: a pan fire gets a lid and the heat off, never water.

THE TOOLBOX
Iron the page, tip over the paint bucket, splat a marker with the hammer: all safely on screen.

SKIP AHEAD IN TIME
Wait 3 days and watch mold grow, food rot and the flies move in. Bake your drawing, freeze it, or leave it in a sunny window for a week and watch the colors fade, except under whatever was lying on top.

WITH THE FULL TOOLBOX (ONE-TIME PURCHASE)
• Garden: mud, sand, leaves and cress seeds that sprout, plus animals that come for the food: a pigeon, a puppy, a cat and a snail.
• Bathroom: a spray bottle, soapy suds that lift the paint, a bleach pen, a squeegee, a hair dryer and a vacuum.
• Craft: tape and stickers that keep the paint off, confetti, googly eyes, stamps, pattern rollers, marbling inks and a toothpick for marbling and scratch art.
• Toy box: roll toy cars and trucks through wet paint, roll a tennis ball through it, squirt the water gun, blow bubbles and squish slime.

FOR PARENTS: KIDS GAMES WITH NO ADS
• No ads, ever. No accounts. No personal data, only anonymous counts.
• Works offline, no Wi-Fi needed: for the car or the plane.
• Settings sit behind a parental gate.
• STEM ideas to talk about together: acids and bases, mold, heat and sunlight.
• Free, with no time limit: the drawing and painting tools, the Kitchen, Science and Toolbox, every time skip, plus water, sponge, paper towel and bleach drops in the Bathroom, glue and glitter in Craft, the face plant in the Toy box, and the ants in the Garden as a welcome gift. A single one-time purchase, made by a grown-up behind a parental gate, adds the full toolbox: the rest of the Garden, Bathroom and Craft, the rest of the Toy box and every tool we add later. No subscription. Seasonal events are free for everyone.
• Your child never sees a price, a lock or a shop: the new tools simply appear.

Made by Game Tailors, a small Dutch studio.