Ping System is a feature in Tower Defense X that is used to combat the Chat Lock system in Roblox. Currently, there are five different buttons, all with their own uses, those buttons being Danger, Need Help, Got It, Sell, and What's This?. It can be used by pressing ALT on PC or clicking the 
on Mobile.
Danger
Danger pings are red in color, and use an exclamation point as its symbol. These pings should be used if an enemy or boss has killed many towers and need replacing, or an enemy that has enough health to kill the base is close by.
Need Help
Need Help pings are blue in color, and have a flag icon as its symbol. These pings strategies are similar to Danger pings, except should be used for a less important issue.
Got It
Got It pings use a light-blue green color, and have a thumbs-up symbol. This ping should be used whenever a player understands their task.
Sell
Sell pings use a dark green color, and have a dollar sign symbol. This ping, as its name suggests, should be used for when the player wants another player to sell a tower.
What's This?
What's This? pings use a yellow color, and have a question mark symbol. This ping can be used if a player finds something in game that they are curious about.
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