Use Flint and Steel when you want the official four-second fuse behavior; use the Detonator when the in-game tool exposes the all-at-once behavior. Keybinds remain an in-game discovery step.
Start here when this is the exact player task you searched for. The sections below turn the question into steps, checks, and next pages.
Flint and Steel behavior and four-second fuse checklist. Visible four-second timing callout and safe-distance steps. Detonator behavior: lights all TNT at once. All-at-once Detonator explanation.
For TNT Voxel Playground Flint and Steel, use the quick answer first, then check whether the topic affects a code reward, event, item, unit, map, build, value, or upgrade path.