CHERRY BLOSSOM GARDEN
Koi State Garden
The garden koi is confused! Give each pond event one clear state-change rule so the koi always knows what to do next.
🧠 Before we start
In Oasis Search Party, your program remembered the next place in a queue. Today it remembers the koi's current state. An event can move the koi to a new state only when a matching rule exists. Programmers call this a state machine.
⭕ Current state
+
🔔 Event
→
✨ Next state
Challenge 1 of 4Build the state rule
1
Build a state-change rule
Tap the three instruction blocks in the order a state machine checks them.
MY VISUAL STATE PROGRAM
1 · REMEMBER
2 · NOTICE
3 · CHANGE
What must the koi remember before an event arrives?
2
Guide three valid transitions
Watch the glowing current state. Tap the event that follows its arrow to the next state.
🍃RESTING
💦SWIMMING
🪷HIDING
🐟
RESTING + Food bell → SWIMMING
The koi is resting. Which event makes it swim?
3
Protect the current state
The koi is HIDING. Pick the event with no matching arrow. A safe state machine ignores it and keeps hiding.
Find the event with no rule from HIDING.
4
Debug the broken arrow
The last rule sends the koi to the wrong state. Tap the pulsing rule, then choose the correct next state.
🍃 RESTING🔔 →💦 SWIMMING
💦 SWIMMING☁️ →🪷 HIDING
Warm sun makes a hidden koi feel safe and calm. Which state comes next?
🌟 What you learned
- A state remembers what a program is doing now.
- An event is something the program notices.
- A transition changes the current state to a next state.
- If no transition matches, the current state stays safe and unchanged.
- Debugging repairs an arrow that points to the wrong next state.