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The code is executed for each enemy object. As it executes for each one, the keyword 'this' will refer to the particular enemy object that the code is currently executing for. Therefore: <Code Omitted>or more simply (since 'this' is implicitly implied when no object is explicitly given to call a method on): <Code Omitted>

The code given by 101929ha will not work. The timer can only work by way of an act method (lines 5 through 8 will only execute once -- when the timer is marked, or started): <Code Omitted>This would be for a 30-second timer in a scenario running at normal speeds -- along Hippo's suggestion.

If you used 'Greenfoot.getRandomNumber(4)', you will get a number in the set { 0, 1, 2, 3 }. Adding one to the result will get you a number between 1 and 4. If you are turning by 't*90' degrees and a turn must be executed then you must remember that '4*90 = 360' and no turn will be exacted (the actor will look in the same direction as before)..

Is the first line inside or outside the method? Where is the code given located and what code starts the game and where is it located?

That works mate, thanks.

You are right -- the Greeps scenario does have an act method that is executed repeatedly (needed because each map is run in a specific amount of time or act cycles). I should not have included that in my list. Maybe I should not ha

Thanks. It works now.

You were right, I didn't notice that 'flash' wasn't set yet. I edited line 28 to: <Code Omitted>

If you want to remove the Ball when it goes off the edge of the screen, then you can put in the Ball class:

You didn't add the constructor to the MyWorld class.

@Nosson1459 Thanks a lot!!

You have code outside classes. That doesn't make much sense to make.

There are several discussions here about games like Tetris. As a general advise: Four blocks form a tetromino. Always move the blocks together. If one fails to fall, move all four back. For making them disappear: Every time a tetromino fails to move further (which also leads to the creation of the next one), check each row if it is full. If any row is full, remove all the blocks in this row and move every block which is above it (smaller y-coordinate) down once. The scoreboard should be made when the rest works.