In such scripting languages, a variable isn't really the same thing as it is in a compiled language: in BlitzPlus it becomes just a machine-code slot with no name (or need for a name) at runtime, whereas in highly dynamic scripting languages it's really a wrapper around a hidden map or hash table. Code that looks the same as an `x = x + 1` is actually doing something like `setValueForKey("x", getValueForKey("x") + 1)`. Which is why you can build up variables just like strings - because they actually are just strings in such languages.
Since BlitzPlus doesn't have such a hidden layer, if you really need to construct slot names at runtime, you'll need to use a data structure and build the indices explicitly. As Floyd points out the simplest case is to use a built-in array. If that's too simple for the names you need to construct (perhaps you aren't actually indexing with numbers?), you could try a TMap ( http://www.blitzbasic.com/codearcs/codearcs.php?code=2574 ), which gives decently fast access on any arbitrary string.
In practice you would probably do much better to re-architect your code to not need the dynamic elements at all, though. Even though your original example puts the number in the middle and adds a "speed" modifier, this is something you can do well with static code too, if you investigate custom types (and put objects of your custom "player" type, containing a "speed" property, into an array).
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