The loadout has five slots. Each slot's number is the keyboard key that places that tower. The fifth slot stays locked until level 15. Some events add a sixth tower for that event, and some modes cut the count instead. Presets: four loadouts, or six with VIP.
Skills
The skill menu opens at level 15. It has four tabs: Defense, Offense, Strategy, and Economy. Bonuses apply to towers, units, base health, or cash gained. One example on the match page is the Fortify skill, which can change base health. Base health otherwise starts at 100.
Resetting the tree refunds 95 percent of what you spent, as Skill Credits. Those credits can only be spent on skills. A reset is not a full refund.
Quests
Four daily quests and two weekly quests appear in the quest menu. You can have two dailies and one weekly active. Only one mission quest can be active. Cancelling wipes progress on that quest. Daily and weekly refill buttons cost Robux, listed as 50 and 120 for the daily refill options. Mission quests are the route for Firework Technician, and the two named quests cannot currently be started.
The index fills in when an enemy drops a logbook. Map records appear after you clear that map on any mode.