Automatic tower upgrades

[littlechris]

hello guys,
i have been playing grid defense for a few months now and I LOVE IT!!!!!! i have gone on to youtube and seen silvermagics videos of levels that i myself have had problems passing. i noticed in the videos that the towers would upgrade without him going to the screen to select upgrade. this was not video editing either. i am just wondering how you do this without going to the actual upload screen. sorry if this is a dumb question.

-C

[Guinnub]

For PC(prolly works for other platforms to). If you double click on a tower it will upgrade

if you doubleclick on a empty spot, it will build the last tower used.

Hope this answer your question