scratch 2 clone wars · 2020. 3. 18. · codeclub.org.uk - if your club is not on the map then...

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IntroductionInthisprojectyou’lllearnhowtocreateagameinwhichyouhaveto

savetheEarthfromspacemonsters.

FollowtheseINSTRUCTIONSonebyone

ClickonthegreenflagtoTESTyourcode

MakesuretoSAVEyourworknow

CloneWarsScratch

2



Step1:MakingaSpaceship

Let’smakeaspaceshipthatwilldefendtheEarth!

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1. StartanewScratchprojectanddeletethecatspritesothat

yourprojectisempty.YoucanfindtheonlineScratcheditor

atjumpto.cc/scratch-new.

2. Addthe‘stars’backdropandthe‘Spaceship’spritetoyour

project.Shrinkthespaceshipandmoveitnearthebottomof

thescreen.

3. Addcodetomoveyourspaceshiptotheleftwhentheleft

arrowkeyispressed.You’llneedtousetheseblocks:



Step2:Lightningbolts

Let’sgivethespaceshiptheabilitytofirelightningbolts!

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4. Addcodetomoveyourspaceshiptotherightwhentheright

arrowkeyispressed.

5. Testyourprojecttoseewhetheryoucancontrolyour

spaceshipwiththearrowkeys.

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1. Addthe‘Lightning’spritefromtheScratchlibrary.Clickthe

sprite’scostumeandturnthelightningupside-down.



Note:Wemovethenewclonetothespaceshipwhileitisstillhidden,before

thenshowingit.Thisjustlooksnicer.

2. Whenthegameisstarted,thelightningshouldbehiddenuntil

thespaceshipfiresitslasercannons.

3. AddthefollowingcodetotheSpaceshiptocreateanew

lightningboltwheneverthespacekeyispressed.

4. Wheneveranewcloneiscreated,itshouldstartinthesame

placeasthespaceship,andthenmoveupthestageuntilit

touchestheedge.AddthefollowingcodetotheLightning

sprite:

1. Testyourlightning,bypressingthespacekey.



Challenge:Fixingthelightning

Whathappensifyoukeepthespacekeyhelddown?Canyou

usea wait blocktofixthis?

Step3:FlyingSpace-hippos

Let’saddlotsofflyinghipposthataretryingtodestroyyourspaceship.

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1. Createanewspritefromthe‘Hippo1’imageintheScratch

library.

2. Setitsrotationstyletobeleft-rightonly,andaddthefollowing

codetohidethespritewhenthegamestarts:



3. Createanewvariablecalled speed ,thatisforthehipposprite

only.

You’llknowifyou’vedonethiscorrectlybecausethevariablewill

havethenameofthespritenexttoit,likethis:

4. Thefollowingcodewillcreateanewhippoeveryfewseconds.

TheStageisagoodplaceforthiscodetolive:

5. Wheneachhippoclonestarts,makeitmovearoundthestage

(atarandomspeed)untilitgetshitbythelightning.Addthis

codetothehipposprite:



6. Testoutyourhippocode.Youshouldseeanewhippoclone

appeareveryfewseconds,eachmovingatitsownspeed.

7. Testyourlasercannon.Ifyouhitahippo,doesitvanish?

8. Whenahippotouchesyourspaceship,weneedtomakethe

spaceshipexplode!Todothis,firstmakesurethatyour

spaceshiphas2costumescalled‘normal’and‘hit’.



Thespaceship’s‘hit’costumecanbemadebyimportingthe

‘Sun’imagefromtheScratchlibrary,andusingthe‘Colora

shape’tooltochangeitscolour.

9. Addthiscodetoyourspaceshipsothatitswitchescostume

wheneveritcollideswithaflyinghippo:

10. Didyounoticethatyouhavebroadcasta‘hit’messageinthe

codeabove?Youcanusethismessagetomakeallofthe

hipposdisappearwhenthespaceshipishit.

Addthiscodetoyourhippo:



Challenge:LivesandScore

Canyouadda lives , score orevena highscore toyour

game?Youcanusethe‘CatchtheDots’projecttohelpyou.

Step4:FruitBats!

Let’smakeafruitbatthatthrowsorangesatyourspaceship.

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11. Testoutthiscodebystartinganewgameandcollidingwitha

hippo.

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1. Firstly,makeanewbatspritethatwill move acrossthetopof

thestage forever .Remembertotestoutyourcode.



2. Ifyoulookatthebat’scostumes,you’llseethatitalreadyhas

2:

Usethe nextcostume blocktomakethebatflapitswingsas

itmoves.

3. Createanew‘Orange’spritefromtheScratchlibrary

4. Addcodetoyourbat,sothatitcreatesaneworangeclone

everyfewseconds.

5. Clickonyourorangespriteandaddthiscodetomakeeach

orangeclonedropdownthestagefromthebattowardsthe

spaceship:



Step5:Gameover

Let’sadda‘gameover’messageattheendofthegame.

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6. Inyourspaceshipsprite,you’llneedtomodifyyourcodeso

thatyouarehitifyoutouchahippooranorange:

7. Testyourgame.Whathappensifyougethitbyafalling

orange?

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1. Ifyouhaven’talready,createanewvariablecalled lives .

Yourspaceshipshouldstartwith3livesandlosealifewhenever



itcollideswithanenemy.Yourgameshouldalsostopwhenyou

runoutoflives.Ifyouneedhelp,youcanusethe‘Catchthe

Dots’projecttohelpyou.

2. Drawanewspritecalled‘GameOver’,usingthetexttool.

3. Onyourstage,broadcasta gameover messagejustbefore

thegameends.

4. Addthiscodetoyour‘GameOver’sprite,sothatthemessage

showsattheendofthegame:

Becauseyou’veuseda broadcast[gameover]andwait block

onyourstage,itwillwaitforthe‘GameOver’spritetobe

displayedbeforeendingthegame.

5. Testyourgame.Howmanypointscanyouscore?Canyou

thinkofwaystoimproveyourgameifitistooeasyortoo

hard?



Challenge:Improveyourgame

Whatimprovementscanyoumaketoyourgame?Hereare

someideas:

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Addhealthpacksthatyoucancollecttogainextralives;

Addfloatingrocksthatyourspaceshipmustavoid;

Makemoreenemiesappearwhenyourscoregetsto100.

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scratch 2 clone wars · 2020. 3. 18. · codeclub.org.uk - if your club is not on the map then...

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