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"Double Trouble"
Episode 4 ・ Cat Galaxy

Get Ready!
Part 1


Last time on
Star Stuff!




We traveled to the Garden Galaxy station, where we met Jazmin!
LUZ


She's shy, but she really knows her stuff! We learned all about sequencing thanks to her.
VALERIA


Hehe...thanks to you two, I worked up the courage to talk to the rest of my station. They'd been arguing over what kind of stars to make...
JAZMIN


After I talked to them, everyone agreed to make all different kinds of garden stars!
JAZMIN


With peace back in the station, Jazmin joined us for the adventure...
LUZ


But as we approached the next galaxy, a claw tried to hit our ship! Where did we end up now?
LUZ
Our story continues...



Whew...just managed to dodge that, whatever it was...
VALERIA


That was one of our adorable cat stars! Welcome to the Cat Galaxy station!
???


Hold up, aren't you Ed? We just met at Fruit Galaxy...why are you here now?
LUZ


Hm? No, we've never met before! You might have met my twin though!
ED?


But yes, my name is Ed-
ED?


AHEM!
???


Um..h-hello?? Oh gosh, more new people...
JAZMIN


Allow us to introduce ourselves! I'm Lem...
LEM


...and I'm Cordy!
CORDY


And we'll take over every galaxy!
LEM & CORDY


Uh...
LUZ


That's right, tremble in fear! We're Wolf's most trusted followers, on special orders to stop you!
LEM


So you're his sidekicks? We're not scared of you.
VALERIA


You seem confident. But let's see how confident you are once we drain all the stardust from this station.
CORDY


So you're here to steal from us, huh? That's just like Wolf...
ED


You...! Say one more bad thing about Wolf, I dare you!
LEM


Relax, Lem. Let's head to their stardust reserve and start our mission. What could they possibly do to stop us?
CORDY


You're right, Cordy! We don't need to worry about these fools. Let's go!
LEM


W-what are we gonna do?!
JAZMIN


Hm...if we restore the galaxy's stars like we usually do, that would fix the stardust problem. Right?
LUZ


It would help for a bit, but they could just steal that stardust as well. We need a way to distract them, or slow them down.
ED


Um...could we just ask them to stop and give the stardust back?
JAZMIN


I don't think...actually, wait. That's a purr-fect idea! While Cordy and Lem are busy draining our stardust...
ED


I'll secretly disable parts of their spaceship! That way, they'll need to use the stardust they took to power the station's spaceship repair!
ED


I see...they won't be able to leave this galaxy otherwise. Meanwhile, the three of us can solve puzzles to help restore the stardust.
LUZ


Got it — we'll leave the spaceship to you, Ed. Luz and Jazmin, are you ready?
VALERIA


Ready! Star Transformer, make me a star!
LUZ & JAZMIN

Okay, here's our first puzzle. I see the Starpad's in the top left. There's two bridges we need to turn on to reach it.

VALERIA



Yeah, we're kinda trapped up here...not much we can do other than code the bots.

LUZ


Since we need to code two bots this time, figuring out the right sequence of steps is a little more complicated.

JAZMIN


So let's start with the basics: which of the two bots should move first?

JAZMIN


The Walker?

LUZ


Or the Grabber?

VALERIA


Actually, could both bots start moving at the same time?

LUZ


I'm not sure yet. Let's try some things and see what happens.

JAZMIN

Explore!
Part 2




Think about
this question while you play...
Which bot should move first?
- The Walker
- The Grabber
- Both should move at the same time
Be ready to vote then discuss once time is up!

Vote before Discussing
Which bot should move first?
Polling...
Responses




The Walker
1
2
3
The Grabber
Both should move at the same time
Let's Pair Share!


Which bot should move first? Why?


Learn!
Part 3



Let's use process of elimination to figure out which bot should move first! What can each bot actually do right now?

JAZMIN



The Walker can either go to button A or button B. That's it.

LUZ


The Grabber can reach cube tray C or cube tray D. But we can't do anything with those without a cube.

VALERIA


There are two cubes here, but the bridges to both of them are off. So the Grabber can't do anything right now.

VALERIA


In that case, we shouldn't move the Grabber first. That also rules out moving both at the same time.

JAZMIN


So the Walker has to move first! Let's figure out what its first line of code should be.

JAZMIN


The Walker can go to either A or B...both buttons turn on a bridge. Maybe start with B, since it's closer?

VALERIA


Let's try it.

LUZ



Hm...it did turn on a bridge, but now the Walker can't move anywhere else. That doesn't seem good.

LUZ



Ah! That's because the Walker crossed a drop bridge — a special kind of bridge that collapses after being crossed once.

JAZMIN


Sounds like we should avoid those bridges until the end, if we can. Let's make the Walker go to button A first instead.

VALERIA


Agreed, I'll change it.

LUZ



Great, now the left bridge is on. That gives the Grabber a path to a cube.

LUZ



Okay! Now that the Grabber can do something, let's switch to coding the Grabber!

JAZMIN


Hm? Why not just keep coding the Walker until it's done?

LUZ


Well, you could try it that way. But that might be a little tricky.

JAZMIN


Since the bots need to help each other move around the puzzle, they'll need to take turns moving.

JAZMIN


I see. The Walker just had its turn to move, so now it's the Grabber's turn — that's what we need to code next.

VALERIA


Right. Since the left bridge is on now, the Grabber can go pick up the cube at position E.

LUZ


I'll switch to the Grabber and add that code. Then, let's test it out.

LUZ



The Grabber fell before the Walker made it to button A...

LUZ



Ah! Right. Since the bots need to take turns, they also need to wait for each other.

JAZMIN


They can do that?

LUZ


Yep! Since bots can trigger events, like pressing a button, other bots can listen for those events using "wait for".

JAZMIN


Makes sense. So before the Grabber picks up the cube at E, we should have it wait for the Walker to step on button A.

VALERIA


I'll add that to the Grabber's code. Then we can run it to make sure it works.

LUZ



That's better. Now we can tell the Grabber to drop the cube in one of the cube trays.

LUZ



Between cube tray C or D...it should probably drop at D first. If it went to C, it would cross the drop bridge and get stuck.

VALERIA


Sounds good. Let's run it again.

LUZ



Yay, now one of the bridges we need to cross is on! Next, the Grabber should...

JAZMIN



Oh wait, it can’t do anything again. We need another cube for cube tray C, but the bridge to the second cube is off.

JAZMIN


If the Grabber is out of options, let's switch back to coding the Walker.

LUZ


What should the Walker's next line of code be? Let's think.

VALERIA


What should the Walker's next line of code be?
Think independently before starting poll
Poll Preview




Vote!
Polling...

Responses

What should the Walker's next line of code be?

3
2
1
"Wait for D"
"Wait for C"
"Go to B"

Vote!
Polling...

Responses

Question

Text
Text
Text
Text
4
3
2
1

Remember, the bots are taking turns. While the Grabber does its turn, we need the Walker to wait before continuing.

JAZMIN


Right, I'll add that as the next line of code. But which object should the Walker wait for?

LUZ



Hmm...not button A or B, since only the Walker can reach those. A bot can't wait on itself.

VALERIA


But the Walker can wait for the Grabber. Since the Grabber ends its turn by using cube tray D, the Walker can "wait for D".

VALERIA


Got it. Now that the Walker is waiting its turn, what should it do next?

LUZ



It should go to button B, since that turns on the other bridge.

VALERIA


Okay, I think that's it for the Walker. Let's run it and check.

LUZ



Looks good! Now we just need the Grabber to move the remaining cube!

JAZMIN



I'll switch back to the Grabber. First, let's make sure it waits before moving again.

LUZ


Since the Walker ends its turn by going to button B, the Grabber needs to "wait for B".

LUZ



Once that bridge is on, the Grabber can go pick up the cube at position F...

VALERIA



...Then drop it at cube tray C.

VALERIA



And that should turn on the second bridge we need to cross! Let's try it.

LUZ


It worked! Thanks to us, the bots learned great teamwork.

VALERIA



Yep, now they know how to "wait for" their turn! Okay, onto the next-

JAZMIN


Well well well, looks like your little team restored one star! Big deal!

LEM


Uh huh...shouldn't you be helping your friend or something?

VALERIA


Oh please! Cordy can handle it on her own. I'm here for some entertainment!

LEM


Psst, Valeria...I don't know why he's doing this, but isn't it good for us if they're separated? They'll work more slowly that way.

LUZ


Oh! True...

VALERIA


Well Lem, we're headed to the next puzzle...not that you could solve it. Better hurry up or we'll leave you behind!

VALERIA


Oh yeah?? Bet I could solve the next one in my sleep, unlike you three!

LEM


He took the bait so easily...

LUZ (THINKING)


We just need to finish our part here, and Ed will do his. We're counting on you, Ed!

LUZ (THINKING)

Keep Going!
Part 4



Keep this in mind as you play...
In today's puzzles, the bots need to take turns helping each other.
- Use process of elimination to decide which bot needs to move, and write some code.
- Use "wait for" to ensure only one bot is moving at a time.
- You'll be switching back and forth between coding both bots. Run your code often to check your progress!

Check In!
Part 5




Lem, I'm done draining all the stardust! We're about to bring Wolf the biggest haul ever...!
CORDY


Haha, he's gonna be so proud of us! Quick, let's head back to our...
LEM


...Our spaceship...
LEM


IT'S WRECKED?!
CORDY & LEM


Teehee!
ED


YOU...! I should've known you were up to something!!
LEM


Wait...not only that, you three restored all of the galaxy's stars??
CORDY


Yep. We even made a new star!
VALERIA


It's a kitten star...isn't it sooooo cute?
LUZ


How...when did you do that?!
CORDY


Cordy, I sent you a message about it on our Talk-Its! Didn't you read it??
LEM


No, I didn't! I was a little busy because someone left me to do all the work by myself!
CORDY


Sorry to break this up — but if you two want to leave this galaxy, you'll have to use your stolen stardust to power the spaceship repair!
ED


Ugh...! Fine! But we'll get you for this, just wait!!
LEM


Mission complete. Thanks again for your help, Ed.
VALERIA


Of course! Those two could learn something about teamwork from us, don't you think?
ED


Totally. How'd they know where to find us, anyway?
LUZ


I think some people are taking notice of the recovering galaxies...you might even have a small group of supporters!
ED


But because of that, Wolf is only going to keep a closer eye on you from here on out. So be careful.
ED


You might not need to worry about those two for a while, though. Look.
ED


We can't go back to Wolf empty-handed! C'mon, let's follow them to the next galaxy!
LEM


No way. We have a duty to update him on the situation. Let's go back to his station.
CORDY


But...! Ugh, forget it. We might never leave this place with how long the line for the repair is!
LEM


Seriously, why are so many of your spaceships broken?!
LEM


We work with cats...you know how it is.
STAR-MAKER A


...Coming here was a mistake.
CORDY


Heh...I see. Well then, let's take this chance to head out.
VALERIA


Safe travels! Maybe I'll see you again sometime!
ED


...I have a feeling we will. See you.
LUZ


Oh, we're here! I've heard a lot about this galaxy!
JAZMIN


And I've heard a lot about you. Sorry, but your time is up.
???
Until next time...





Meanwhile, Sol...

Tinker to understand how BOOM and WEAK work!
- Touch and push objects



- Use blocks to make and break rules
- Pause to read rules
with the Inspector
- Ask, "What do I notice?" after trying something
In problem 1, which of Zorro's observations is the most useful?
- The lava is orange
- There's a lot of snow
- There's a rule for ROCK IS DEFEAT
- Walking on lava seems scary
Be ready to vote then discuss
why after time is up!
You can also use the Inspector
to read rules and learn more about state blocks!

- What do I notice and what could be useful?
- What is the goal?
- What is blocking me
from the goal? Why?
To understand a problem,
ask yourself these questions:
Once you understand a problem,
plan a solution by asking yourself these questions:
- How can I break this problem into smaller steps?
- What order should I do these steps in?

Work independently
to solve problems!
Next lesson, you will solve problems independently to show what you’ve learned!
Asking the Guiding Questions


Inspecting rules and objects

Inspecting state blocks
If you get stuck, try:
In problem 1, learn about SINK
by making the rules shown below.



SOL IS SINK
GOLD IS SINK



FOSSIL IS SINK









Both 2 and 3
Which rule(s) are helpful
for solving the problem?
1
2
3
4
Be ready to vote then discuss
after time is up!

Click to undo
your last move
Click to reset
the problem



Inspect state blocks

Inspect rules and objects

Reset the problem
Shortcut: Press the R key
Undo your last move
Shortcut: Press the Z key

As you play, make observations
about problems by asking yourself:
"What do I notice and
what could be useful?"
Some useful things to notice are:
- Rules that are already
in the problem - New rules you could make with the blocks in the problem


Focus on rules
See a reminder of how a state block works

Sol's friends will ask you
questions during your journey.
Try to help them out by
answering correctly!

Star Stuff LCR: Lesson 4
By sophiekansmith
Star Stuff LCR: Lesson 4
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