What do you mean by "game speed"?
Also, you can get and set any cvar (whether or not it does what you want when you change it depends on the cvar). Simply use the cvar functions in AMX Mod X:
Code:
get_cvar_*()
get_pcvar_*()
set_cvar_*()
set_pcvar_*()
To use the pcvar functions with cvars that are not created in your plugin, use get_cvar_pointer() to get the proper reference to the cvar.
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