Choose your first experiment
Choose "Let’s make an oops!" to begin. "Explore the adventures" opens the chapter map. Mission 1, "Feed the Elephant", asks you to guide the mango into Mimi’s basket. Its toolbox starts with ramps, so begin with a simple slope rather than a complicated machine.
- Drag a Ramp into the blue construction area, or select the tool and then tap the scene.
- Place the ramp below the mango. Aim its lower end toward the basket. Select the ramp to adjust its Angle, Size, or position in the inspector.
- Predict which way the mango will roll, then choose Play. Watch where it lands and how fast it reaches the basket.
Use a miss as evidence
The mango starts falling when the simulation begins. If it misses, its path helps you see whether it rolled away from the basket, left the ramp too early, or arrived too quickly. Use "Try again" after a failed run. Reset returns you to construction; Pause lets you inspect motion during a run.
Change one thing per attempt. Move the ramp if the mango never reaches it; change the slope if the direction is wrong. More pieces can introduce new collisions. Notice overlap warnings before running. Later missions add more tools and surface choices, including the inspector’s Surface setting.
Compare results and stars
Science View provides another way to inspect the experiment. The mission panel and reward screen explain "How stars work": the main goal and optional construction or delivery targets can differ between missions. A successful delivery does not automatically mean every optional target was met.
For keyboard building, select a construction piece, move it with the arrow keys, rotate it with R, and remove it with Delete. Space plays or pauses. Undo and Redo let you compare construction changes.
Keep these controls nearby.
| Control | What it does |
|---|---|
| Ramp tool | Drag a ramp into the construction area, or select the tool and tap the scene. |
| Construction inspector | Select a piece to change position, Angle, Size and the properties available to it. |
| Play / Pause | Run the experiment or pause to inspect the motion. Space also plays or pauses. |
| Reset / Try again | Return to construction or retry after a failed run. |
| Arrow keys / R / Delete | With a piece selected: move it, rotate it, or remove it. |
| Undo / Redo | Compare construction edits without rebuilding everything. |
When the next step is unclear.
- The mango rolls away from Mimi.
- Look at which end of the ramp is lower. Reverse the slope if it points away from the basket.
- The mango falls past the ramp.
- Move the ramp under its falling path before changing its angle. A steeper ramp cannot catch a mango that misses it.
- A delivery succeeds but a star is missing.
- Read How stars work. A mission can add a piece limit or delivery target to the basic goal.
- The construction behaves unexpectedly.
- Check overlap warnings and remove unnecessary pieces. Change one position or slope at a time so you can explain the result.
ONE THING TO TRY
Compare two slopes, not two whole machines.
Keep the same ramp and starting position. Try one gentle downward slope and note where the mango leaves it. Reset, change only the angle, and compare the path. If the mango misses, use the visible trace to choose the next small adjustment.
Which result changed because of the angle, and what stayed the same?
Save an invention you want to revisit
Progress saves in this browser. Open My inventions to keep a named construction; "Export build" makes a copy you can retain outside browser storage, and "Import build" brings one back. Saved constructions can reopen in Free Build Lab, where the tools you have unlocked are available.
The game uses simplified two-dimensional physics. Treat its measurements as clues for the challenge, not engineering specifications for a real machine.
For account return access, read the player privacy notice. An account and a browser-local game save have different recovery limits.
For playing together.
PUT THE IDEA INTO PLAY
Build a slope. Follow the mango.
Take one prediction into the game, then explain what changed.
Bonus levels: Gravity Delivery
Tune the launcher and send the sample into three trays. The dotted trail shows the path gravity creates. Play the bonus levels ↗