diff --git a/core/src/Scoreboard.cpp b/core/src/Scoreboard.cpp
index 57af12f..cbc11ef 100644
--- a/core/src/Scoreboard.cpp
+++ b/core/src/Scoreboard.cpp
@@ -151,3 +151,176 @@ const char* displaySlotName(DisplaySlot slot) {
     return "unknown";
 }
 
+std::string ScoreObjective::formatScore(int score) const {
+    if (format == Format::Distance) {
+        long long centimetres = score;
+        std::string sign = centimetres < 0 ? "-" : "";
+        long long magnitude = centimetres < 0 ? -centimetres : centimetres;
+        return sign + std::to_string(magnitude / 100) + "." + twoDigits(magnitude % 100) + " m";
+    }
+    if (format == Format::Duration) {
+        long long ticks = score < 0 ? 0 : score;
+        long long seconds = ticks / ticksPerSecond;
+        long long hours = seconds / 3600;
+        long long minutes = (seconds % 3600) / 60;
+        long long rest = seconds % 60;
+        if (hours > 0)
+            return std::to_string(hours) + "h " + twoDigits(minutes) + "m " + twoDigits(rest) + "s";
+        if (minutes > 0) return std::to_string(minutes) + "m " + twoDigits(rest) + "s";
+        return std::to_string(rest) + "s";
+    }
+    return std::to_string(score);
+}
+
+bool ScoreTeam::hasMember(const std::string& player) const {
+    return std::find(members.begin(), members.end(), player) != members.end();
+}
+
+const char* scoreTeamColorName(ScoreTeam::Color color) {
+    switch (color) {
+        case ScoreTeam::Color::White: return "white";
+        case ScoreTeam::Color::Gray: return "gray";
+        case ScoreTeam::Color::Black: return "black";
+        case ScoreTeam::Color::Red: return "red";
+        case ScoreTeam::Color::Green: return "green";
+        case ScoreTeam::Color::Blue: return "blue";
+        case ScoreTeam::Color::Yellow: return "yellow";
+        case ScoreTeam::Color::Aqua: return "aqua";
+        case ScoreTeam::Color::Purple: return "purple";
+        case ScoreTeam::Color::Gold: return "gold";
+        case ScoreTeam::Color::Count: break;
+    }
+    return "unknown";
+}
+
+bool Scoreboard::addObjective(const ScoreObjective& objective) {
+    if (objective.name.empty()) return false;
+    if (objectives.count(objective.name) > 0u) return false;
+    objectives[objective.name] = objective;
+    return true;
+}
+
+bool Scoreboard::removeObjective(const std::string& name) {
+    if (objectives.erase(name) == 0u) return false;
+    manualScores.erase(name);
+    for (std::string& slot : slots)
+        if (slot == name) slot.clear();
+    return true;
+}
+
+const ScoreObjective* Scoreboard::objective(const std::string& name) const {
+    auto found = objectives.find(name);
+    return found == objectives.end() ? nullptr : &found->second;
+}
+
+std::vector<std::string> Scoreboard::objectiveNames() const {
+    std::vector<std::string> out;
+    out.reserve(objectives.size());
+    for (const auto& entry : objectives) out.push_back(entry.first);
+    return out;
+}
+
+StatSheet& Scoreboard::stats(const std::string& player) { return sheets[player]; }
+
+const StatSheet* Scoreboard::statsFor(const std::string& player) const {
+    auto found = sheets.find(player);
+    return found == sheets.end() ? nullptr : &found->second;
+}
+
+std::vector<std::string> Scoreboard::players() const {
+    std::vector<std::string> out;
+    for (const auto& sheet : sheets) out.push_back(sheet.first);
+    for (const auto& objectiveScores : manualScores)
+        for (const auto& entry : objectiveScores.second)
+            if (std::find(out.begin(), out.end(), entry.first) == out.end())
+                out.push_back(entry.first);
+    for (const auto& membership : teamByPlayer)
+        if (std::find(out.begin(), out.end(), membership.first) == out.end())
+            out.push_back(membership.first);
+    std::sort(out.begin(), out.end());
+    return out;
+}
+
+bool Scoreboard::setScore(const std::string& objectiveName, const std::string& player, int value) {
+    const ScoreObjective* target = objective(objectiveName);
+    if (target == nullptr || target->automatic() || player.empty()) return false;
+    manualScores[objectiveName][player] = value;
+    return true;
+}
+
+bool Scoreboard::addScore(const std::string& objectiveName, const std::string& player, int delta) {
+    const ScoreObjective* target = objective(objectiveName);
+    if (target == nullptr || target->automatic() || player.empty()) return false;
+    long long updated = static_cast<long long>(score(objectiveName, player)) + delta;
+    manualScores[objectiveName][player] = clampToScore(updated);
+    return true;
+}
+
+bool Scoreboard::resetScore(const std::string& objectiveName, const std::string& player) {
+    auto found = manualScores.find(objectiveName);
+    if (found == manualScores.end()) return false;
+    return found->second.erase(player) > 0u;
+}
+
+void Scoreboard::resetPlayer(const std::string& player) {
+    for (auto& objectiveScores : manualScores) objectiveScores.second.erase(player);
+    sheets.erase(player);
+}
+
+int Scoreboard::statScore(const ScoreObjective& target, const std::string& player) const {
+    const StatSheet* sheet = statsFor(player);
+    if (sheet == nullptr) return 0;
+    if (target.statSubject < 0) return clampToScore(sheet->total(target.statKind));
+    return clampToScore(sheet->value(target.statKind, target.statSubject));
+}
+
+int Scoreboard::score(const std::string& objectiveName, const std::string& player) const {
+    const ScoreObjective* target = objective(objectiveName);
+    if (target == nullptr) return 0;
+    if (target->automatic()) return statScore(*target, player);
+    auto objectiveScores = manualScores.find(objectiveName);
+    if (objectiveScores == manualScores.end()) return 0;
+    auto entry = objectiveScores->second.find(player);
+    return entry == objectiveScores->second.end() ? 0 : entry->second;
+}
+
+bool Scoreboard::tracked(const std::string& objectiveName, const std::string& player) const {
+    const ScoreObjective* target = objective(objectiveName);
+    if (target == nullptr) return false;
+    if (target->automatic()) return sheets.count(player) > 0u;
+    auto objectiveScores = manualScores.find(objectiveName);
+    if (objectiveScores == manualScores.end()) return false;
+    return objectiveScores->second.count(player) > 0u;
+}
+
+std::vector<ScoreEntry> Scoreboard::entries(const std::string& objectiveName) const {
+    std::vector<ScoreEntry> out;
+    const ScoreObjective* target = objective(objectiveName);
+    if (target == nullptr) return out;
+    if (target->automatic()) {
+        for (const auto& sheet : sheets) {
+            ScoreEntry entry;
+            entry.player = sheet.first;
+            entry.score = statScore(*target, sheet.first);
+            out.push_back(entry);
+        }
+    } else {
+        auto objectiveScores = manualScores.find(objectiveName);
+        if (objectiveScores != manualScores.end()) {
+            for (const auto& scored : objectiveScores->second) {
+                ScoreEntry entry;
+                entry.player = scored.first;
+                entry.score = scored.second;
+                out.push_back(entry);
+            }
+        }
+    }
+    const bool ascending = target->sort == ScoreObjective::Sort::Ascending;
+    std::sort(out.begin(), out.end(), [ascending](const ScoreEntry& a, const ScoreEntry& b) {
+        if (a.score != b.score) return ascending ? a.score < b.score : a.score > b.score;
+        return a.player < b.player;
+    });
+    for (ScoreEntry& entry : out) entry.formatted = target->formatScore(entry.score);
+    return out;
+}
+