FIRST LEGO League Bundle Guide
Three divisions, three age ranges, three different equipment stacks. The honest buying and registration guide for FLL Discover, Explore, and Challenge.
FIRST LEGO League is a three-tier robotics program run by FIRST in partnership with the LEGO Group. Discover for ages 4-6, Explore for ages 6-10, Challenge for ages 9-16. Each tier runs a new season each year with a new theme, a new robot-game field, and a new research project.
An FLL season is not just hardware. It is (1) a season-specific materials bundle, (2) a team registration fee with FIRST, (3) adult coaches who have done the coach training, and (4) event registration if the team wants to compete at tournaments. Budget all four before you commit.
Short version
Ages 4-6: FLL Discover - Duplo-based, story-driven, smallest kit, lowest cost.
Ages 6-10: FLL Explore - Spike Essential + season mission model, ~$400-600/year.
Ages 9-16: FLL Challenge - Spike Prime + season robot game kit, $500-900/year.
Plus: Team registration with FIRST (separate from equipment).
Required: At least one adult coach per team. Coach training is free online.
Do not buy FLL equipment before you have a coach
Every year, some schools order the full FLL Challenge season bundle in August, discover in September that no adult has signed up to coach, and watch the kit sit in a closet until spring.
FLL at every tier requires at least one volunteer coach - a teacher, parent, or staff member who commits to 2-3 hours per week during the season (roughly August through January for Challenge). The coach does not need to be an engineer. They need to be an organized adult who shows up. FIRST provides free coach training online, and the resources are good.
Secure the coach first. Then register the team. Then buy the bundle. Not the other way around.
FLL Discover (ages 4-6)
FLL Discover is the preK-K tier. Not a robotics competition in the traditional sense - it is a guided play experience with DUPLO-based materials tied to the annual theme. Teams ("Discover Sets") are 2-6 children with two adult team leaders. No competition events; the "showcase" is a local event where teams present their project posters.
The season bundle is a box of DUPLO, theme-specific materials, and a guided activity plan. Registration is through FIRST's class pack or team options. This is the gentlest on-ramp to FIRST programs.
FLL Explore (ages 6-10)
FLL Explore is the grades 2-4 tier (previously branded FLL Jr.). Teams of up to 6 kids build a motorized model tied to the annual theme, using LEGO Spike Essential plus a season-specific "Inspire Set" with extra theme pieces. The team also builds a poster and presents their research project at a local event.
Budget assumes the team already owns a Spike Essential set. If not, add the kit cost. Explore is a friendlier competition tier than Challenge - the events are showcase-style, not head-to-head robot battles, and judges score on presentation and learning rather than on speed.
FIRST also sells a Class Pack option for schools running Explore as a classroom activity rather than a competition team - this bundles multiple team registrations and curriculum materials into one PO.
FLL Challenge (ages 9-16)
FLL Challenge is the flagship competition tier. Teams of 2-10 kids design, build, and program a Spike Prime robot to complete missions on a 4x8 foot competition mat. Plus a research project on the season's theme.
The annual Challenge Set (season-specific mission models and mat) runs roughly $95 for the base set; the fuller Team Set (models + mat + competition materials) runs around $200-250 per season. Class Packs and larger bundles are available. U.S. team registration is $225 plus shipping as of the 2025-2026 UNEARTHED season (verify current rates on the FIRST cost page).
This is a serious commitment. A competing Challenge team meets 2-3 times a week for roughly 5 months. Coaches put in real hours. The payoff for the kids is enormous - Challenge alums consistently cite the program as formative.
What to pair with FLL
A season-ready FLL team needs more than the bundle.
LEGO Spike Essential or Spike Prime
Explore uses Spike Essential. Challenge uses Spike Prime. If your school does not already own these kits, budget them in addition to the FLL season materials. See our buying guides for Spike Essential and Spike Prime.
Practice mat and table
Challenge teams need a practice field, not just the competition field. A dedicated 4x8 foot table with the current season's mat taped down and borders built up is a massive morale boost for a team. Some schools use a hollow-core door on sawhorses.
Team registration with FIRST
All three tiers require team registration on the FIRST Dashboard. This is separate from the physical bundle purchase. Registration unlocks the season materials, judging rubrics, and tournament eligibility. Do this before ordering the kit.
Coach training (free, online)
FIRST publishes free online coach training for each tier. New coaches should budget an evening or two in August to walk through it before the season kicks off. The kids will be fine; the coach just needs to know the rules.
Your regional FIRST Partner
Every region has a Program Delivery Partner that runs local tournaments and answers new-team questions. Find yours through the FIRST regional support page. For Georgia, that is Georgia FIRST.
Team storage
A Challenge team will accumulate a full parts bin of LEGO, a mat that rolls up to 4 feet, posterboards, notebooks, and a travel case for the robot. Plan a dedicated closet or rolling cart. The mat especially wants flat storage - do not fold it.
What to skip
How FLL seasons go wrong before they start.
Running FLL without a trained coach
Covered above as the Rule One. No coach = no team. "We will find one" is not a plan. Identify the named person before the equipment hits the loading dock.
Agree to Disagree ›Ordering the kit before registering the team
The FIRST Dashboard gates some season materials behind team registration. Ordering the physical bundle first means you have a box of parts you cannot yet use. Register first (which gets you the digital materials immediately), then order the physical kit.
Agree to Disagree ›Mixing Explore and Challenge kits across seasons
Explore and Challenge are different programs with different seasons, different mats, different judging, and different rules. A team cannot "graduate" mid-season from Explore to Challenge. Pick one tier for the team and commit for the year. Kids can move up between school years.
Agree to Disagree ›Running last year's FLL Challenge season
You will occasionally see schools offered a "great deal" on last year's Challenge season kit. It is still a functional set of LEGO mission models, but the current-season events only accept the current-season rules. For a team that does not plan to compete at a tournament, running a prior season is fine. For a team aiming at a regional event, always use the current season.
Agree to Disagree ›All the links
Every product and resource mentioned on this page.